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independent variable reference group

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allisonlixiao

independent variable reference group

Hi, everyone
I am running a multnomial logistic regression using a mix of cont. and cat. variables. One of the variable has three categories and the values are 0, 1 and 2. In the notes of the parameter estimate table it shows th parameter of both "0" category and "2" category are set to zero because they are is redundant. Does that mean SPSS used bot as reference groups? this does not make sense to me and probably indicates some problem of my data. Can someone explain this to me? Thank you!

Bruce Weaver

Re: independent variable reference group

Administrator

Can you provide a small data set that illustrates the problem?

allisonlixiao wrote

Hi, everyone
I am running a multnomial logistic regression using a mix of cont. and cat. variables. One of the variable has three categories and the values are 0, 1 and 2. In the notes of the parameter estimate table it shows th parameter of both "0" category and "2" category are set to zero because they are is redundant. Does that mean SPSS used bot as reference groups? this does not make sense to me and probably indicates some problem of my data. Can someone explain this to me? Thank you!

--
Bruce Weaver
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"When all else fails, RTFM."

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Maguin, Eugene

Re: independent variable reference group

In reply to this post by allisonlixiao

I don't understand this either. Would you (somehow) post the syntax and the estimates table, including the subscripted notes.

-----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of allisonlixiao
Sent: Wednesday, December 05, 2012 10:41 PM
To: [hidden email]
Subject: independent variable reference group

Hi, everyone
I am running a multnomial logistic regression using a mix of cont. and cat.
variables. One of the variable has three categories and the values are 0, 1 and 2. In the notes of the parameter estimate table it shows th parameter of both "0" category and "2" category are set to zero because they are is redundant. Does that mean SPSS used bot as reference groups? this does not make sense to me and probably indicates some problem of my data. Can someone explain this to me? Thank you!

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