how to interpret the principal axis factor analysis in r definition of parallel analysis which method uses the principle of the kaiser criterion to determine the number of factors to retain? why does a parallel analysis need to be performed what is the eigenvalue of a principal axis factor? eigenvalue retention definition if you are retaining one factor in a factor analysis, which factor is retained what is a parallel analysis in exploratory factor analysis why is it important to retain the first factor in a factor? what is the eigenvalue of a factor what is the importance of parallel analysis how to use parallel analysis when does a parallel analysis of a random sample result what is the eigenvalue for a parallel analysis analysis of factor define parallel analysis in psychology which factor should be retained in the principal axis factor analysis? what is the purpose of a parallel factor analysis which criterion is used by horn to justify a parallel analysis? what eigenvalue should a factor be retained who developed parallel data analysis