1. Analyze the simulated Buhs and Ladd data (“Buhs & Ladd data.sav” or Buhs & Ladd data.xls”) using a structural equation modeling program (if you are using Amos, the initial model is saved as “Buhs & Ladd 1.amw”; the Mplus script is also online).
a. Estimate the models discussed in this chapter. Study the parameter estimates and standard errors, the fit statistics, modification indexes, and standardized residuals.
b. Interpret the model. Be sure to interpret the indirect and total effects in addition to the direct effects.
c. Compare the initial model with the competing model discussed in this chapter (the Achievement Effect model). Do you agree that this model is a better alternative? What theoretical, logical, and research evidence can you offer in support of this model? What evidence argues against this model?
d. Are there other alternative models that you are interested in testing? Do so; be sure to evaluate the relative fit of the model and to interpret your findings.
e. Are there any common causes that the authors may have neglected? How could you investigate the possibility of unmeasured common causes more completely?
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