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I want to examine the psychometric properties (e.g. internal consistency, factorial validity) of a scale. The data (N=700) comes from 16 different locations. Central means and variances did not differ considerably. However, I wonder, whether I should make adjustments to the data before further analysis. I am not sure whether and if so, how I can possibly apply general procedures for "control of variables" (such as those described here: How exactly does one “control for other variables”?).

Tina Kanina
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    You could use a mixed model with random effects for centers. – kjetil b halvorsen Apr 13 '20 at 16:06
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    Many thanks for the quick answer and the recommendation! I'll try to do that. I'm not so familiar with it and wonder if I can use the results in the analysis of internal consistency and CFA. But I think I just have to get familiar with it a bit first. – Tina Kanina Apr 14 '20 at 11:22

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