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From |
Juan Julio Gutierrez <juanju@yahoo.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: Polychoric and missing values in correlation matrix |

Date |
Thu, 9 Apr 2009 04:50:44 -0700 (PDT) |

Dear all I am using the polychroric command to calculate the correlation matrix of a set of 17 variables ( 8 binary 0-/1 and 9 metric). After lenghty calculations STATA shows a matrix with missing values in the matrix, mostly between metric and binary variables. 4 metric variables have missing values correlations with binary variables. The results window show these messages. In red: could not calculate numerical derivatives missing values encountered initial values not feasible too few quotes no variables defined And in green: numerical derivatives are approximate nearby values are missing Do you have an idea why am I facing these results? How can I assure that the corr. matrix is positive defined? Do you know if using R poly command would dela with the missing values? . Thank you Juan Julio * * 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: Polychoric and missing values in correlation matrix***From:*Stas Kolenikov <skolenik@gmail.com>

**Re: st: Polychoric and missing values in correlation matrix***From:*Maarten buis <maartenbuis@yahoo.co.uk>

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