Programming the statistical procedures from SAS

Profile analysis - validation of homogeneity of covariance

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Occasional Contributor
Posts: 14

Profile analysis - validation of homogeneity of covariance

Hi,

 

Could you suggest a solution to a Profile analysis when the assumption of homogeneity of covariance is violated.

 

I have three groups with different number of observations in every group (197, 188, 167) and nine dependent variables.

 

When I run the test for homogeneity of covariances, I get a significant Chi-square statistic.

 

Thank you in advance.

 

Regards,

 

Yuliya

Respected Advisor
Posts: 2,655

Re: Profile analysis - validation of homogeneity of covariance

Consider some sort of mixed modeling approach, where you can model heterogeneity of variance.

 

Steve Denham

Occasional Contributor
Posts: 14

Re: Profile analysis - validation of homogeneity of covariance

Hi Steve,

 

thank you very much for your reply.

 

It was my assignment at the University, so I have just described the problems I faced while analysing the data (violation of heterogeneity of variances) and possible decisions.

 

However, I have not considered mixed modelling approach, just because I had no idea about that. But thank you for your suggestion, I am quite curious so I will try to apply it.

 

Regards,

 

Yuliya

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