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面包屑導航結束 --> <!-- 頁面標題開始 --> <div id="n1l1njb9b" class="title"> <h3><a>基于SEM的用戶可用性需求客觀重要度分析<small></small></a></h3> </div> <!-- 頁面標題結束 --> <hr class="featurette-divider"> <!-- 中部開始 --> <div id="n1l1njb9b" class="container"> <!-- 正文 --> <div id="n1l1njb9b" class="lead" id="print"> <p> <span id="n1l1njb9b" class="16" style="line-height: 21.85pt; text-indent: 0pt; font-size: 9pt; font-family: MingLiU; letter-spacing: 0pt;">3.2.2</span><span id="n1l1njb9b" class="16" style="line-height: 21.85pt; text-indent: 0pt; font-size: 9pt; font-family: MingLiU; letter-spacing: 0pt;">基于</span><span id="n1l1njb9b" class="18" style="line-height: 21.85pt; text-indent: 0pt; font-size: 9pt; font-family: 'Times New Roman'; letter-spacing: 0pt;">SEM</span><span id="n1l1njb9b" class="16" style="line-height: 21.85pt; text-indent: 0pt; font-size: 9pt; font-family: MingLiU; letter-spacing: 0pt;">的用戶可用性需求客觀重要度分析</span></p> <p class="NewStyle32" style="margin-left: 0pt; text-indent: 0pt; line-height: 21.85pt;"><span style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-weight: bold; font-size: 9pt;">3.2.2.1</span><span id="n1l1njb9b" class="20" style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;">結構方程模型</span><span style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-weight: bold; font-size: 9pt;"><o:p></o:p></span></p> <p class="NewStyle31" style="margin-left: 0pt; text-indent: 0pt; line-height: 19.45pt;"><!--[if !supportLists]--><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 11pt;">① </span><!--[endif]--><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;">結構方程模型概念界定及原理</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;"><o:p></o:p></span></p> <p class="NewStyle31" style="margin-left: 0pt; text-indent: 18pt; line-height: 19.45pt;"><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;">結構方程模型一般包括因子模型和因果模型兩種模型。而因子模型也可以稱為測量模 型，構成因子模型的方程也就可以成為測量方程，因果模型也被稱為結構模型，其所對應 的方程是結構方程</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt; vertical-align: super;">[111]</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;">。該方法是基于對各變量和組成方差矩陣進行分析的基礎之上的，是 一種用于分析變量之間的相互關系的統計方法。其中，測量模型主要指代潛變量與指標間 的內在關系，結構模型表示各個潛在變量的關系。</span></p> <p class="NewStyle31" style="margin-left: 0pt; text-indent: 18pt; line-height: 19.7pt;"><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;">通過建立各內生與外源變量及其衡量指標之間的關聯，可以在系統的環境下，模擬計 算以后，獲得</span><span id="n1l1njb9b" class="23" style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 9pt;">A</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;">，、</span><span id="n1l1njb9b" class="23" style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 9pt;">A</span><span id="n1l1njb9b" class="23" style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 9pt; vertical-align: sub;">v</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;">，并獲得指標與變量之間的內在關聯，這比不計整體環境而只是衡 量變量與指標的關系更為合理。這種全面完整的考慮能夠完整的模擬并最終計算出各個變 量在整個系統中的影響權重。因此在結構模型分析以后，根據所取得的關系系數，然后再 算出變量的權重更為合理</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt; vertical-align: super;">[111]</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;">。</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;"><o:p></o:p></span></p> <p class="NewStyle31" style="margin-left: 0pt; text-indent: 0pt; line-height: 11pt;"><!--[if !supportLists]--><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 11pt;">② </span><!--[endif]--><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;">實施步驟</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;"><o:p></o:p></span></p> <p class="NewStyle31" style="margin-left: 0pt; text-indent: 18pt; line-height: 19.45pt;"><!--[if !supportLists]--><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 11pt;">③ </span><!--[endif]--><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;">模型建構：通過理論分析和實踐分析，建立相應的模型，并假定各潛變量與觀測 變量之間的關系等。</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;"><o:p></o:p></span></p> <p class="NewStyle31" style="margin-left: 0pt; text-indent: 18pt; line-height: 19.45pt;"><!--[if !supportLists]--><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 11pt;">④ </span><!--[endif]--><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;">模型擬合：對結構方程參數模型進行估計，并給出模型的解集。極大似然估計是 </span><span id="n1l1njb9b" class="23" style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 9pt;">AMOS</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;">軟件中是一種極其適用的參數估計方法。模型估計方法在選取時，要把估計技術與 統計檢驗的選擇、樣本大小等各類因素都考慮進來。該方法適用于正態分布數據。</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;"><o:p></o:p></span></p> <p class="NewStyle31" style="margin-left: 0pt; text-indent: 18pt; line-height: 19.45pt;"><!--[if !supportLists]--><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 11pt;">⑤ </span><!--[endif]--><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;">模型評價：模型評價，顧名思義就是對構建的模型進行評價，評價構建和擬合的 模型是否合理，對理論模型和數據之間的擬合程度問題進行評價。一般使用擬合指數這個 參數來評價擬合的優良程度。常用擬合指數及其判斷準則整理如表3.6。</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;"><o:p></o:p></span></p> <p class="NewStyle31" style="margin-left: 0pt; text-indent: 18pt; line-height: 19.45pt;"><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;">結構方程模型要進行評價，主要是用擬合優度指標來衡量。表</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;">3.6</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;">是常用擬合指數及</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;"><o:p></o:p></span></p> <table class="MsoNormalTable" style="border-collapse:collapse; width:482.1500pt; mso-table-layout-alt:fixed; mso-padding-alt:0.0000pt 5.4000pt 0.0000pt 5.4000pt ; "> <tbody> <tr style="height:52.3000pt; "> <td width="148" valign="top" style="width: 111.6pt; padding: 0pt 5.4pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="NewStyle31" style="margin-left: 0pt; text-indent: 0pt; line-height: 11pt;"><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;">判斷準則。</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;"><o:p></o:p></span></p> </td> <td width="494" valign="bottom" style="width: 370.55pt; padding: 0pt 5.4pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="NewStyle31" style="margin-left: 0pt; text-indent: 0pt; line-height: 11pt;"><span id="n1l1njb9b" class="26" style="font-family: 宋體; letter-spacing: 1pt; font-weight: bold; font-size: 9pt;">表</span><span id="n1l1njb9b" class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">3.6</span><span id="n1l1njb9b" class="26" style="font-family: 宋體; letter-spacing: 1pt; font-weight: bold; font-size: 9pt;">常用擬合指數一覽表</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;"><o:p></o:p></span></p> </td> </tr> <tr style="height:28.1000pt; "> <td width="148" valign="center" style="width: 111.6pt; padding: 0pt 5.4pt; border-top-width: 0.5pt; border-top-style: solid; border-top-color: windowtext; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="NewStyle31" style="margin-left: 0pt; text-indent: 0pt; line-height: 9.5pt;"><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">擬合指數</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;"><o:p></o:p></span></p> </td> <td width="494" valign="center" style="width: 370.55pt; padding: 0pt 5.4pt; border-top-width: 0.5pt; border-top-style: solid; border-top-color: windowtext; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="NewStyle31" style="margin-left: 0pt; text-indent: 0pt; line-height: 9.5pt;"><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">判斷準則</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;"><o:p></o:p></span></p> </td> </tr> <tr style="height:53.3000pt; "> <td width="148" valign="center" style="width: 111.6pt; padding: 0pt 5.4pt; border-top-width: 0.5pt; border-top-style: solid; border-top-color: windowtext; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="NewStyle31" style="margin-left: 0pt; text-indent: 0pt; line-height: 12.7pt;"><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">卡方自由度比 </span><span id="n1l1njb9b" class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">(CMIN/DF)</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;"><o:p></o:p></span></p> </td> <td width="494" valign="center" style="width: 370.55pt; padding: 0pt 5.4pt; border-top-width: 0.5pt; border-top-style: solid; border-top-color: windowtext; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="NewStyle31" style="margin-left: 0pt; text-indent: 0pt; line-height: 13.45pt;"><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">在一般模型比較時，若所得卡方自由度的值低于</span><span id="n1l1njb9b" class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">1</span><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">時，則該模型構建擬合就可 認為是過度擬合；若卡方自由度的值高于</span><span id="n1l1njb9b" class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">3</span><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">,則該模型構建擬合可認為是不合 理的。若卡方自由度值在</span><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">（</span><span id="n1l1njb9b" class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">1, 3)</span><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">之間意味著模型適配良好。</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;"><o:p></o:p></span></p> </td> </tr> <tr style="height:39.1000pt; "> <td width="148" valign="center" style="width: 111.6pt; padding: 0pt 5.4pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="NewStyle31" style="margin-left: 0pt; text-indent: 0pt; line-height: 13.7pt;"><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">顯著性 </span><span id="n1l1njb9b" class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">(p</span><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">值）</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;"><o:p></o:p></span></p> </td> <td width="494" valign="center" style="width: 370.55pt; padding: 0pt 5.4pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="NewStyle31" style="margin-left: 0pt; text-indent: 0pt; line-height: 13.9pt;"><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">顯著性有一個閥值，一般來說，如果這個值大于</span><span id="n1l1njb9b" class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">0.05</span><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">時，說明模型擬合優度良 好，反之，則認為模型擬合不合理。</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;"><o:p></o:p></span></p> </td> </tr> <tr style="height:53.7500pt; "> <td width="148" valign="center" style="width: 111.6pt; padding: 0pt 5.4pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="NewStyle31" style="margin-left: 0pt; text-indent: 0pt; line-height: 12.25pt;"><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">比較擬合指數 </span><span id="n1l1njb9b" class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">(CFI)</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;"><o:p></o:p></span></p> </td> <td width="494" valign="center" style="width: 370.55pt; padding: 0pt 5.4pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="NewStyle31" style="margin-left: 0pt; text-indent: 0pt; line-height: 13.45pt;"><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">該指數表示當前結構模型相對于獨立模型</span><span id="n1l1njb9b" class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">(</span><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">假設變量之間互不相關的結構模型） 的擬合優度，這個值的取值在</span><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">（</span><span id="n1l1njb9b" class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">0, 1)</span><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">間，越接近</span><span id="n1l1njb9b" class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">1</span><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">表示模型擬合優度良好， 通常只要這個值大于</span><span id="n1l1njb9b" class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">0.9,</span><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">就說明這個模型是較合理的。</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;"><o:p></o:p></span></p> </td> </tr> <tr style="height:62.1500pt; "> <td width="148" valign="center" style="width: 111.6pt; padding: 0pt 5.4pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="NewStyle31" style="margin-left: 0pt; text-indent: 0pt; line-height: 11.75pt;"><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">擬合優度指數 </span><span id="n1l1njb9b" class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">(GFI)</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;"><o:p></o:p></span></p> </td> <td width="494" valign="center" style="width: 370.55pt; padding: 0pt 5.4pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="NewStyle31" style="margin-left: 0pt; text-indent: 0pt; line-height: 13.45pt;"><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">這個指數是模型擬合程度的絕對指數，取值范圍也是</span><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">（</span><span id="n1l1njb9b" class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">0,1)</span><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">之間，同樣數字越 接近</span><span id="n1l1njb9b" class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">1</span><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">擬合程度越好，通常來說大于</span><span id="n1l1njb9b" class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">0.9,</span><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">認為研究者提出的模型可接受，而當 比較擬合指數大于</span><span id="n1l1njb9b" class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">0.9</span><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">之時，它的數值只要大于</span><span id="n1l1njb9b" class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">0.85</span><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">即可。</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;"><o:p></o:p></span></p> </td> </tr> <tr style="height:51.1000pt; "> <td width="148" valign="center" style="width: 111.6pt; padding: 0pt 5.4pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="NewStyle31" style="margin-left: 0pt; text-indent: 0pt; line-height: 12.25pt;"><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">近似誤差均方根 </span><span id="n1l1njb9b" class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">(RMSEA)</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;"><o:p></o:p></span></p> </td> <td width="494" valign="center" style="width: 370.55pt; padding: 0pt 5.4pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="NewStyle31" style="margin-left: 0pt; text-indent: 0pt; line-height: 13.2pt;"><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">該指數越低表示擬合效果越好，一般來說這個參數小于</span><span id="n1l1njb9b" class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">0.1</span><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">時，表示模型合理 程度好，如果小于</span><span id="n1l1njb9b" class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">0.01</span><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">，那么這個模型的效果就很好，但是這種情況很難出現。</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;"><o:p></o:p></span></p> </td> </tr> <tr style="height:61.7000pt; "> <td width="148" valign="bottom" style="width: 111.6pt; padding: 0pt 5.4pt; border-bottom-width: 0.5pt; border-bottom-style: solid; border-bottom-color: windowtext; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="NewStyle31" style="margin-left: 0pt; text-indent: 0pt; line-height: 13.2pt;"><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">調整擬合優度指數 </span><span id="n1l1njb9b" class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">(AGFI</span><span id="n1l1njb9b" class="28" style="font-family: 宋體; letter-spacing: 3pt; font-size: 9pt;">)</span><span id="n1l1njb9b" class="28" style="font-family: 宋體; letter-spacing: 3pt; font-size: 9pt;">,規范擬合 </span><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">指數</span><span id="n1l1njb9b" class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">(NFI</span><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">)</span><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">和增值擬合 指數</span><span id="n1l1njb9b" class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">(IFI)</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;"><o:p></o:p></span></p> </td> <td width="494" valign="top" style="width: 370.55pt; padding: 0pt 5.4pt; border-bottom-width: 0.5pt; border-bottom-style: solid; border-bottom-color: windowtext; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="NewStyle31" style="margin-left: 0pt; text-indent: 0pt; line-height: 13.7pt;"><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">這些指數越接近</span><span id="n1l1njb9b" class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">1</span><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">表示模型適合度越好，通常采用取值范圍在</span><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">（</span><span id="n1l1njb9b" class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">0,1</span><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">)</span><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">，如果這 個參數值比</span><span id="n1l1njb9b" class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">0.9</span><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">大時表示這個模型的擬合程度很好，而且越是接近</span><span id="n1l1njb9b" class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">1</span><span id="n1l1njb9b" class="29" style="font-family: 宋體; letter-spacing: 0.5pt; font-size: 9pt;">越好。</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 9pt;"><o:p></o:p></span></p> </td> </tr> </tbody> </table> <p class="MsoNormal"><span style="font-family: MingLiU; letter-spacing: 0pt; font-size: 9pt;">模型修正：若模型擬合度低，則需要調整參數來修正模型，然后再進行擬合參數 的評價，如果不合理還需要繼續進行修正，直到擬合參數達到合理值。然而不能全部根據 擬合數據來修正模型，也應該考慮待修改的參數理論上是否合理，經反復修正使模型與參 數擬合度達到最優。</span></p> <p class="MsoNormal"> </p> <p class="MsoNormal"><span style="font-size:9.0pt;font-family:宋體;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">本文采摘自“基于</span><span lang="EN-US" style="font-size:9.0pt">QFD</span><span style="font-size:9.0pt; font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">的加工中心可用性保障技術研究”，因為編輯困難導致有些函數、表格、圖片、內容無法顯示，有需要者可以在網絡中查找相關文章！</span><span lang="EN-US" style="font-size:9.0pt"><o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:9.0pt;font-family:宋體;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">本文由伯特利數控整理發表文章均來自網絡僅供學習參考，轉載請注明！</span><span lang="EN-US" style="font-size:9.0pt"><o:p></o:p></span></p> <p class="MsoNormal"> </p> <p class="MsoNormal"><span style="font-size:9.0pt;font-family:宋體;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">相關內容可查閱：主頁（</span><b><span lang="EN-US" style="font-size:9.0pt"><a ><span lang="EN-US" style="font-family:宋體; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">加工中心</span></a></span></b><span style="font-size:9.0pt; font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">）、產品頁（</span><b><span lang="EN-US" style="font-size:9.0pt"><a >CNC<span lang="EN-US" style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman""><span lang="EN-US">加工中心</span></span></a></span></b><span style="font-size:9.0pt;font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">）、文章頁（</span><b><span lang="EN-US" style="font-size:9.0pt"><a ><span lang="EN-US" style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">數控加工中心</span></a></span></b><span style="font-size:9.0pt;font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">）</span><span lang="EN-US" style="font-size:9.0pt"><o:p></o:p></span></p></div> <div id="n1l1njb9b" class="blank30"></div> <!-- tag --> <div id="n1l1njb9b" class="blank10"></div> 標簽： <a href='/index.php?case=tag&act=show&tag=%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>加工中心</a> <a href='/index.php?case=tag&act=show&tag=%E6%95%B0%E6%8E%A7%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>數控加工中心</a> <a href='/index.php?case=tag&act=show&tag=CNC%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>CNC加工中心</a> <a href='/index.php?case=tag&act=show&tag=%E7%AB%8B%E5%BC%8F%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>立式加工中心</a> <a href='/index.php?case=tag&act=show&tag=%E7%BA%BF%E8%BD%A8%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>線軌加工中心</a> <a href='/index.php?case=tag&act=show&tag=%E9%AB%98%E9%80%9F%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>高速加工中心</a> <!-- 分類 --> <div id="n1l1njb9b" class="blank10"></div> 分類： <a href='/bethel/type/jnc/type-1.html' 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