

Parallel analysis and bifactor EFA 

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I wonder whether the ideal number of factor to retain with a bifactor efa is N or N+1, given N is the number of factor suggested by parallel analysis. Because a perfect 5 factor oblique structure would be best recovered by 6 (and not 5) factors with a bifactor efa (1 general & 5 specific). What would you recommend ? Best regards Philippe 


Bifactor EFA with 1 general and m1 specific factors has the same model fit (same ML loglikelihood and number of parameters) as an mfactor regular EFA. So bifactor EFA with a total number of m factors is just a different rotation than the mfactor EFA. In your case, if you have perfect fit for 5 EFA factors, you would also have that same perfect fit for a bifactor model with 1 general and 4 specific factors. So, if parallel analysis suggests 5 factors, you can go with bifactor using 1 general and 4 specifics; i.e. asking for 5 factors when doing bifactor EFA. 


Thank you very much. That makes a lot of sense. 

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