# IIA test (or Hausman test) in SPSS

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## IIA test (or Hausman test) in SPSS

 Is it possible to conduct a IIA test (Independence from Irrelevant Attributes) in either Logistic or Multinomial Logistic Regression ?? The Hausman Test is often used. Is that, or other tests available in SPSS? Thank you!
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## Re: IIA test (or Hausman test) in SPSS

 Judging from the Wikipedia page on the Hausman test (which I'd never heard of), it should not be too hard to program it in the matrix language.       http://en.wikipedia.org/wiki/Hausman_testThe formula shown near the top, for example would look like this, I think: compute H = T(B1-B0)*GINV(VarB0-VarB1)*(B1-B0). where (if I followed): B0 = a column vector of coefficients under the null hypothesis B1 = a column vector of coefficients under the alternative hypothesis VarB0 = a column vector of squared standard errors for B0 VarB1 = a column vector of squared standard errors for B1 HTH. Ange wrote Is it possible to conduct a IIA test (Independence from Irrelevant Attributes) in either Logistic or Multinomial Logistic Regression ?? The Hausman Test is often used. Is that, or other tests available in SPSS? Thank you! -- Bruce Weaver bweaver@lakeheadu.ca http://sites.google.com/a/lakeheadu.ca/bweaver/"When all else fails, RTFM." NOTE: My Hotmail account is not monitored regularly. To send me an e-mail, please use the address shown above.
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## Re: IIA test (or Hausman test) in SPSS

 It would seem that since B0 and B1 are Vectors, VarB0 and VarB1 would be matrices since there are covariances among the B's.  Looks like the MATRIX math would follow as indicated ;-) -- Bruce Weaver wrote Judging from the Wikipedia page on the Hausman test (which I'd never heard of), it should not be too hard to program it in the matrix language.       http://en.wikipedia.org/wiki/Hausman_testThe formula shown near the top, for example would look like this, I think: compute H = T(B1-B0)*GINV(VarB0-VarB1)*(B1-B0). where (if I followed): B0 = a column vector of coefficients under the null hypothesis B1 = a column vector of coefficients under the alternative hypothesis VarB0 = a column vector of squared standard errors for B0 VarB1 = a column vector of squared standard errors for B1 HTH. Ange wrote Is it possible to conduct a IIA test (Independence from Irrelevant Attributes) in either Logistic or Multinomial Logistic Regression ?? The Hausman Test is often used. Is that, or other tests available in SPSS? Thank you! Please reply to the list and not to my personal email. Those desiring my consulting or training services please feel free to email me. --- "Nolite dare sanctum canibus neque mittatis margaritas vestras ante porcos ne forte conculcent eas pedibus suis." Cum es damnatorum possederunt porcos iens ut salire off sanguinum cliff in abyssum?"
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