Saturday, April 21, 2007

report data in SEM

  • Correlation matrix with standard deviations of the observed variables, rounding to three decimal place (Hoyle&Panter,1995) -- the most generous report
  • covariance matrix + means of the observed variables. Even if your SEM doesn't concern means, the means of all observed variables should be reported in written sumary for other researchers to re-run the SEM
  • to get covariance matrix in Amos, view -- text output--sample moment (sample covariance matrix
  • correlation matrix + standard deviation of all observed variables + (means)
  • It is highly recommended to provide means for covariance matrix or correlation matrix+ standard deviation
  • When data are not interval-level data, the data need be preprocessed so that a tetrachoric matrix (for dichotomous data) or polychoric matrix (for ordered-categorical variables) is estimated and analyzed in SEM.
  • When additional assumptions are made about the measurement level of the raw data in the model, such assumptions should be explicitly reported.
  • Information about univariate and multivariate distribution should be presented and interpreted.

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