longitudinal invariance

[yf liu]

Hi,

I am wondering what data format should be used to test longitudinal invariance? I think there is paper suggesting wide format, but I am wondering why long format doesn't work? 

I feel that using long format is similar as examining gender invariance with gender as a group variable, why we cannot use time point as a group variable using long format to examine longitudinal invariance?

Thank you very much in advance!

Best wishes,

Yuanfei 

[Rönkkö, Mikko]

Hi,

 

You can use time as a group variable and test measurement invariance that way. The reason why we use wide-form data is that, typically, it is not realistic to assume that indicator error terms are uncorrelated over time.

 

Best regards,

 

Mikko

 

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