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More about Missing Data
Model B
Here is a program for fitting Model B. In this program, the same parameter name
(mn_vocab) is used for the vocab mean of the young group as for the vocab mean of
the old group. In this way, the young group and old group are required to have the same
vocab mean. The program is saved as Ex18-b.vb.
Amos reports the fit of Model B as:
The difference in fit measures between Models B and A is 7.85 (= 437.813 – 429.963),
and the difference in the number of parameters is 1 (= 10 – 9). These are the same
figures we obtained earlier with Amos Graphics.
Sub Main()
Dim Sem As New AmosEngine
Try
Sem.TextOutput()
Sem.Crdiff()
Sem.ModelMeansAndIntercepts()
Sem.BeginGroup(Sem.AmosDir & "Examples\atty_mis.sav")
Sem.GroupName("young_subjects")
Sem.Mean("vocab", "mn_vocab")
Sem.Mean("v_short")
Sem.BeginGroup(Sem.AmosDir & "Examples\atto_mis.sav")
Sem.GroupName("old_subjects")
Sem.Mean("vocab", "mn_vocab")
Sem.Mean("v_short")
Sem.FitModel()
Finally
Sem.Dispose()
End Try
End Sub
Function of log likelihood = 437.813
Number of parameters = 9