On 6 Feb 2003 05:27:37 -0800, [EMAIL PROTECTED] (bayene) wrote: > Dear all, > > I want to perform Confirmatory Factor Analysis by using AMOS 4.0.I > have the scales of likert (22 items) and non-normal distribution of my > data.
If you are calling it "non-normal" by virtue of being Likert, that's not apt to be a problem. > Can I use spearman's correlations like input data for AMOS ? Using Spearman's is equivalent to performing a rank-transformation, then doing Pearsons. Using the rank-transformation is not good when there are a lot of ties, or when the correlations are especially high -- Don't you have both problems? > or polychoric 's correlations ? Some folks like them. I just know that for tetrachoric r's, there is enough extra error, you need (say) twice the N. Do you have N=450 for your 22 items, instead of N=220? However, I don't know whether tetrachoric is worse or better than polychoric for N. -- Rich Ulrich, [EMAIL PROTECTED] http://www.pitt.edu/~wpilib/index.html . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
