layout: true <div class="my-footer"><span>ouzhang.me/talk/mi_in_SAS</span></div> <!-- this adds the link footer to all slides, depends on my-footer class in css--> --- name: xaringan-title class: left, inverse, middle background-image: url(img/sas4.jpg) background-size: cover # Measurement invariance in SAS ### .fancy[Use SAS program for MI in CFA] .large[Ou Zhang | Psychometrics conf::2014] <!-- this ends up being the title slide since seal = FALSE--> --- class: right, middle <img class="circle" src="img/Ou_Zhang.jpg" width="150px"/> # Find me at... 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margin: auto;" /> ] -- .pull-right[ - The example data from the book chapter by Thompson and Green (2006, p.139, Table 5.2, Dataset 2) were borrowed. - The data contains six measured variables aiming to assess preschool children academic (V1-V3) and social school readiness (V4-V6). - Preschool children were divided into two groups: - Group 1—day-care - Group 2—home-care - Two matrices of means and covariances for Group 1 and Group 2 are used - The sample sizes are 250 and 150 for Group 1 and Group 2, respectively. ] --- ## .center[CFA Model for MI] -- <img src="img/sas_model_example.png" width="35%" style="display: block; margin: auto;" /> --- name: PROC CALIS ## .center[PROC CALIS] -- - The <span style="color: red;">PROC CALIS</span> procedure (**Covariance Analysis of Linear Structural Equations**) estimates parameters and tests the appropriateness of structural equation models using covariance structural analysis. -- - Although PROC CALIS was designed to specify linear relations, structural equation modeling (SEM) techniques have the flexibility to test nonlinear trends. CFA is a special case of SEM. -- - PROC CALIS and options for CFA - <span style="color: red;">DATA</span> : specified dataset to be analyzed -- - <span style="color: red;">COV</span> : covariance matrix -- - <span style="color: red;">CORR</span> : correlation matrix --- ## .center[LINEQS Modeling Language in SAS] -- - The <span style="color: blue;">LINEQS</span> statement is a main model specification statement that invokes the LINEQS modeling language in SAS. -- - The syntax for the LINEQS modeling language is as follows: - <span style="color: blue;">LINEQS</span> _< equation < , equation . . . > > ;_ - <span style="color: blue;"> VARIANCE</span> _partial-variance-parameters;_ - <span style="color: blue;">COV</span> _covariance-parameters ;_ - <span style="color: blue;">MEAN</span> mean-parameters ; --- ## .center[SAS program example] -- <img src="img/sas_program.PNG" width="80%" style="display: block; margin: auto;" /> --- ## .center[SAS Program (combined model)] -- <img src="img/sas_program2.PNG" width="80%" style="display: block; margin: auto;" /> --- name: Open file class: center, inverse, middle # .fancy[Please open the SAS lineqs code for measurement invariance.sas.] --- name: Thank you class: center, middle background-image: url(img/sas2.jpg) background-size: cover # .fancy[Thank you!]