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letter-spacing: 0pt;">3.2.2</span><span class="16" style="line-height: 21.85pt; text-indent: 0pt; font-size: 9pt; font-family: MingLiU; letter-spacing: 0pt;">基于</span><span class="18" style="line-height: 21.85pt; text-indent: 0pt; font-size: 9pt; font-family: 'Times New Roman'; letter-spacing: 0pt;">SEM</span><span class="16" style="line-height: 21.85pt; text-indent: 0pt; font-size: 9pt; font-family: MingLiU; letter-spacing: 0pt;">的用户可用性需求客观重要度分析</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 class="20" style="font-family: 宋体; letter-spacing: 0pt; font-size: 9pt;">结构方程模型</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: 宋体; letter-spacing: 0pt; font-size: 11pt;">① </span><!--[endif]--><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 9pt;">结构方程模型概念界定及原理</span><span style="font-family: 宋体; 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: 宋体; letter-spacing: 0pt; font-size: 9pt;">结构方程模型一般包括因子模型和因果模型两种模型。而因子模型也可以称为测量模 型，构成因子模型的方程也就可以成为测量方程，因果模型也被称为结构模型，其所对应 的方程是结构方程</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 9pt; vertical-align: super;">[111]</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 9pt;">。该方法是基于对各变量和组成方差矩阵进行分析的基础之上的，是 一种用于分析变量之间的相互关系的统计方法。其中，测量模型主要指代潜变量与指标间 的内在关系，结构模型表示各个潜在变量的关系。</span></p> <p class="NewStyle31" style="margin-left: 0pt; text-indent: 18pt; line-height: 19.7pt;"><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 9pt;">通过建立各内生与外源变量及其衡量指标之间的关联，可以在系统的环境下，模拟计 算以后，获得</span><span class="23" style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 9pt;">A</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 9pt;">，、</span><span class="23" style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 9pt;">A</span><span class="23" style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 9pt; vertical-align: sub;">v</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 9pt;">，并获得指标与变量之间的内在关联，这比不计整体环境而只是衡 量变量与指标的关系更为合理。这种全面完整的考虑能够完整的模拟并最终计算出各个变 量在整个系统中的影响权重。因此在结构模型分析以后，根据所取得的关系系数，然后再 算出变量的权重更为合理</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 9pt; vertical-align: super;">[111]</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 9pt;">。</span><span style="font-family: 宋体; 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: 宋体; letter-spacing: 0pt; font-size: 11pt;">② </span><!--[endif]--><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 9pt;">实施步骤</span><span style="font-family: 宋体; 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: 宋体; letter-spacing: 0pt; font-size: 11pt;">③ </span><!--[endif]--><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 9pt;">模型建构：通过理论分析和实践分析，建立相应的模型，并假定各潜变量与观测 变量之间的关系等。</span><span style="font-family: 宋体; 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: 宋体; letter-spacing: 0pt; font-size: 11pt;">④ </span><!--[endif]--><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 9pt;">模型拟合：对结构方程参数模型进行估计，并给出模型的解集。极大似然估计是 </span><span class="23" style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 9pt;">AMOS</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 9pt;">软件中是一种极其适用的参数估计方法。模型估计方法在选取时，要把估计技术与 统计检验的选择、样本大小等各类因素都考虑进来。该方法适用于正态分布数据。</span><span style="font-family: 宋体; 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: 宋体; letter-spacing: 0pt; font-size: 11pt;">⑤ </span><!--[endif]--><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 9pt;">模型评价：模型评价，顾名思义就是对构建的模型进行评价，评价构建和拟合的 模型是否合理，对理论模型和数据之间的拟合程度问题进行评价。一般使用拟合指数这个 参数来评价拟合的优良程度。常用拟合指数及其判断准则整理如表3.6。</span><span style="font-family: 宋体; 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: 宋体; letter-spacing: 0pt; font-size: 9pt;">结构方程模型要进行评价，主要是用拟合优度指标来衡量。表</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 9pt;">3.6</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 9pt;">是常用拟合指数及</span><span style="font-family: 宋体; 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: 宋体; letter-spacing: 0pt; font-size: 9pt;">判断准则。</span><span style="font-family: 宋体; 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 class="26" style="font-family: 宋体; letter-spacing: 1pt; font-weight: bold; font-size: 9pt;">表</span><span class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">3.6</span><span class="26" style="font-family: 宋体; letter-spacing: 1pt; font-weight: bold; font-size: 9pt;">常用拟合指数一览表</span><span style="font-family: 宋体; 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 class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">拟合指数</span><span style="font-family: 宋体; 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 class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">判断准则</span><span style="font-family: 宋体; 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 class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">卡方自由度比 </span><span class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">(CMIN/DF)</span><span style="font-family: 宋体; 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 class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">在一般模型比较时，若所得卡方自由度的值低于</span><span class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">1</span><span class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">时，则该模型构建拟合就可 认为是过度拟合；若卡方自由度的值高于</span><span class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">3</span><span class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">,则该模型构建拟合可认为是不合 理的。若卡方自由度值在</span><span class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">（</span><span class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">1, 3)</span><span class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">之间意味着模型适配良好。</span><span style="font-family: 宋体; 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 class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">显著性 </span><span class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">(p</span><span class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">值）</span><span style="font-family: 宋体; 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 class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">显著性有一个阀值，一般来说，如果这个值大于</span><span class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">0.05</span><span class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">时，说明模型拟合优度良 好，反之，则认为模型拟合不合理。</span><span style="font-family: 宋体; 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 class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">比较拟合指数 </span><span class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">(CFI)</span><span style="font-family: 宋体; 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 class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">该指数表示当前结构模型相对于独立模型</span><span class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">(</span><span class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">假设变量之间互不相关的结构模型） 的拟合优度，这个值的取值在</span><span class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">（</span><span class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">0, 1)</span><span class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">间，越接近</span><span class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">1</span><span class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">表示模型拟合优度良好， 通常只要这个值大于</span><span class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">0.9,</span><span class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">就说明这个模型是较合理的。</span><span style="font-family: 宋体; 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 class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">拟合优度指数 </span><span class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">(GFI)</span><span style="font-family: 宋体; 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 class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">这个指数是模型拟合程度的绝对指数，取值范围也是</span><span class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">（</span><span class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">0,1)</span><span class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">之间，同样数字越 接近</span><span class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">1</span><span class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">拟合程度越好，通常来说大于</span><span class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">0.9,</span><span class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">认为研究者提出的模型可接受，而当 比较拟合指数大于</span><span class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">0.9</span><span class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">之时，它的数值只要大于</span><span class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">0.85</span><span class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">即可。</span><span style="font-family: 宋体; 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 class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">近似误差均方根 </span><span class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">(RMSEA)</span><span style="font-family: 宋体; 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 class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">该指数越低表示拟合效果越好，一般来说这个参数小于</span><span class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">0.1</span><span class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">时，表示模型合理 程度好，如果小于</span><span class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">0.01</span><span class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">，那么这个模型的效果就很好，但是这种情况很难出现。</span><span style="font-family: 宋体; 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 class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">调整拟合优度指数 </span><span class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">(AGFI</span><span class="28" style="font-family: 宋体; letter-spacing: 3pt; font-size: 9pt;">)</span><span class="28" style="font-family: 宋体; letter-spacing: 3pt; font-size: 9pt;">,规范拟合 </span><span class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">指数</span><span class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">(NFI</span><span class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">)</span><span class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">和增值拟合 指数</span><span class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">(IFI)</span><span style="font-family: 宋体; 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 class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">这些指数越接近</span><span class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">1</span><span class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">表示模型适合度越好，通常采用取值范围在</span><span class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">（</span><span class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">0,1</span><span class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">)</span><span class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">，如果这 个参数值比</span><span class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">0.9</span><span class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">大时表示这个模型的拟合程度很好，而且越是接近</span><span class="27" style="font-family: Constantia; letter-spacing: 0pt; font-size: 9pt;">1</span><span class="29" style="font-family: 宋体; letter-spacing: 0.5pt; font-size: 9pt;">越好。</span><span style="font-family: 宋体; 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：若模型拟合度低，则需要调整参数来修正模型，然后再进行拟合参数 的评价，如果不合理还需要继续进行修正，直到拟合参数达到合理值。然而不能全部根据 拟合数据来修正模型，也应该考虑待修改的参数理论上是否合理，经反复修正使模型与参 数拟合度达到最优。</span></p> <p class="MsoNormal"> </p> <p class="MsoNormal"><span style="font-size:9.0pt;font-family:宋体;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:宋体;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术研究”，因为编辑困难导致有些函数、表格、图片、内容无法显示，有需要者可以在网络中查找相关文章！</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:宋体;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">本文由伯特利数控整理发表文章均来自网络仅供学习参考，转载请注明！</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:宋体;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">相关内容可查阅：主页（</span><b><span lang="EN-US" style="font-size:9.0pt"><a href="http://www.bethel-cnc.com/"><span lang="EN-US" style="font-family:宋体; 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:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">）、产品页（</span><b><span lang="EN-US" style="font-size:9.0pt"><a href="http://www.bethel-cnc.com/bethel/cnc/">CNC<span lang="EN-US" style="font-family:宋体;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:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">）、文章页（</span><b><span lang="EN-US" style="font-size:9.0pt"><a href="http://www.bethel-cnc.com/bethel/news/"><span lang="EN-US" style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">数控加工中心</span></a></span></b><span style="font-size:9.0pt;font-family:宋体;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 class="blank30"></div> <!-- tag --> <div class="blank10"></div> 标签： <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'>数控加工中心</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> 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<p>加工精度是影响机床性能和产品质量的主要难题，也是制约国家精密制造能力的重要因素。本文以五轴加工中心为对象，针对提升机床精度进行了研究。并且随着科技的发展，精密的仪器和零件在生产实践中占据的分量逐渐增加，在数控机床这种精密机器精度不断提高的同时，必须控制内外界环境的随机影响因素在… <a href="/bethel/5-aix/show-2958.html" target="_blank">[了解更多]</a></p> </div> <!-- 内容列表结束 --> </div> <!-- 相关文章结束 --> <!-- 页底推荐图文产品开始 --> <hr class="featurette-divider"> <!-- 页面标题开始 --> <div class="title"> <h3 class="wow bounceInDown" data-wow-delay="0.5s"><a href="/bethel/cnc">产品中心<small></small></a></h3> <span>——</span> </div> <!-- 页面标题结束 --> <div class="container"> <div class="blank30"></div> <!-- 中部开始 --> <div class="row"> <div class="col-xs-12 col-sm-3 col-md-3 col-lg-3"> <p></p> <p><a title="" href="/bethel/cnc" class="content-bottom-list-more">Learn more</a></p> </div> <div class="col-xs-12 col-sm-9 col-md-9 col-lg-9"> <div class="row"> <div class="post-masonry col-xs-12 col-sm-6 col-md-4 col-lg-4"> <a title="U260T五轴钻攻中心" href="/bethel/cnc/show_37.html" class="img-auto"> <img class="img-responsive" alt="U260T五轴钻攻中心" 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