Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

From |
Red Owl <rh.redowl@liu.edu> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
Re: st: Factors correlated after -predict-... What is going wrong? |

Date |
Thu, 12 Dec 2013 05:32:59 -0500 |

Trevor, See mv.pdf (from help factor postestimation) on p. 317 in Stata 13.x documentation, which states: "estat common displays the correlation matrix of the common factors. For orthogonal factor loadings, the common factors are uncorrelated, and hence an identity matrix is shown. estat common is of more interest after oblique rotations." I recommend that you rely on the results of -pwcorr- or -corr- after varimax rotation instead of -estat common- for your purposes. Although varimax rotation is an orthogonal procedure, it does not guarantee perfectly uncorrelated factor scores. Red Owl redowl@liu.edu >> Hi Statalist, >> >> I am using -factor- to develop three factors, rotating them using -rotate, varimax- and then produce variables from the factors using -predict-. Varimax is orthogonal rotation so should produce factors with zero correlation. Testing the factors' correlation after rotation with -estat common- produces the expected result, that correlation is 0. However, after I produce variables from the factors using -predict-, these new variables are correlated. How? Why? I tried replicating the steps using the example dataset from the manual (/r12/sp2), and in that case the predicted variables also have zero correlation. So, I guess it's something unique to my dataset, but I have no idea what. Any ideas? >> <snipped> >> Thanks, >> Trevor Zink * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: Factors correlated after -predict-... What is going wrong?***From:*William Buchanan <william@williambuchanan.net>

- Prev by Date:
**Re: st: Krippendorff's alpha** - Next by Date:
**Re: st: Fitting a linear regression where coefficients are bounded proportions** - Previous by thread:
**st: Factors correlated after -predict-... What is going wrong?** - Next by thread:
**Re: st: Factors correlated after -predict-... What is going wrong?** - Index(es):