Hi all I am trying to perform Exploratory Factor Analysis using proc factor with priors=smc , but am not sure which factor extraction method to use. O’Rourke and Hatcher (2013) suggest that Maximum Likelihood (ML) is the preferred method, but when I use that, I receive the "Communality greater than 1.0" error. Khattree and Naik (2000:150) say we can use the HEYWOOD or ULTRAHEYWOOD options to get past this error, but caution of improper solutions as a result. Should I use ML with HEYWOOD, or should I rather use Principal Factor (PRIN) instead? If I use ML with HEYWOOD, how will I know whether the resultant solution is valid or improper? I'm using SAS release 3.4 University Edition. Ross
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