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From |
"Carlo Lazzaro" <carlo.lazzaro@tin.it> |

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

Subject |
st: error 506 (matrix not positive definite) when bootstrapping eigenvalue after one-way manova |

Date |
Tue, 14 Jun 2011 15:19:26 +0200 |

Dear Statalisters, before bootstrapping eigenvalue after one-way manova using auto.dta and Stata 9.2/SE, I imposed the equality of the means in price and mpg for both foreign and domestic cars. When I invoked bootstrap, error message r(506) related to model term foreign appeared. Can anybody please give me some hint about the reason of this drawback and how to work it around? Thanks a lot for your kindness and for your time. Kindest Regards, Carlo ------------code begins----------------------- use "C:\Programmi\Stata9\ado\base\a\auto.dta" manova price mpg=foreign svmat double c, name(eigen_m) scalar sctr=trace(c) by foreign, sort: sum price sum price if foreign==0, meanonly replace price=price-r(mean)+6384.682 if foreign==0 sum price if foreign==1, meanonly replace price=price-r(mean)+6384.682 if foreign==1 by foreign, sort: sum mpg sum mpg if foreign==0, meanonly replace mpg= mpg-r(mean)+24.77273 if foreign==0 sum mpg if foreign==1, meanonly replace mpg= mpg-r(mean)+24.77273 if foreign==1 bootstrap trace(c), reps(10000) nodots strata(foreign) bca seed(12345) : manova price mpg=foreign failure for model term foreign an error occurred when bootstrap executed manova r(506); ------------code ends----------------------- * * 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: error 506 (matrix not positive definite) when bootstrapping eigenvalue after one-way manova***From:*Austin Nichols <austinnichols@gmail.com>

**Re: st: error 506 (matrix not positive definite) when bootstrapping eigenvalue after one-way manova***From:*Sergiy Radyakin <serjradyakin@gmail.com>

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