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From |
Robert A Yaffee <bob.yaffee@nyu.edu> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Factor Analysis with ordinal and binary variables |

Date |
Tue, 02 Jun 2009 15:32:23 -0400 |

Stefan, Karl Joreskog and Dag Sorbom analyzed the problem back in the 1980s and found that you could use polyserial and polychoric correlations for a factor analysis of dichotomous or ordinal variables. If the ordinal variables have at least 15 levels they can be treated as continuous. They have incorporated this finding in their program for structural equation modeling. Regards, Bob Yaffee Bengt Muthen may have also written on this subject in the 1980s or early 1990s. Robert A. Yaffee, Ph.D. Research Professor Silver School of Social Work New York University NSF grant: http://www.colorado.edu/ibs/es/nuclear_disaster_risk/principal_investigators.html Biosketch: http://homepages.nyu.edu/~ray1/Biosketch2009.pdf CV: http://homepages.nyu.edu/~ray1/vita.pdf ----- Original Message ----- From: "stefan.duke@gmail.com" <stefan.duke@gmail.com> Date: Tuesday, June 2, 2009 7:51 am Subject: st: Factor Analysis with ordinal and binary variables To: statalist@hsphsun2.harvard.edu > Hello, > > I have question concerning factor analysis on variables with different > measurement levels. > > The questionnaire consists of binary and ordinal variables. If I would > have just binary variables, I would use the tetrachoric correlation > coefficients. For the ordinal I assume approx. normality and then use > the ordinary factor analysis capability. > > But what do I do when I have both variables? Is it an option to > construct the variance-covariance matrix by hand? And what do I take > for the correlation between binary and ordinal? > > Maybe is there a model class which takes care of that, that yields > similar outcomes as factor analysis but can deal with such kind of > data (e.g. correspondence analysis). > > I am grateful for every hint. > > Best, > Stefan > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: Factor Analysis with ordinal and binary variables***From:*Robert A Yaffee <bob.yaffee@nyu.edu>

**References**:**st: Factor Analysis with ordinal and binary variables***From:*"stefan.duke@gmail.com" <stefan.duke@gmail.com>

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