Date:         Tue, 11 Jan 2011 00:10:50 -0800
Reply-To:     lcl23 <chuiling23@gmail.com>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         lcl23 <chuiling23@gmail.com>
Subject:      problem with logistic regression - linearity to the logit
Content-Type: text/plain; charset=us-ascii

Hi, I am a very beginner in stat. Now working on a research which apply
logistic regression. I already entered all the data into SPSS & done with
coding. Now, I presumed I should start with testing the assumption?

So, I tested the linearity of the logit. I created the log for each
continuous IV & ran it using binary logistic, but the output showed such
warning :
Warning # 602
>The argument for the natural log function is less than or equal to zero.
>The result has been set to the system-missing value.

The p value all came out to be 0.999 & 1.0. My missing cases were 740 out of
total sample of 800! I think this should be the problem of zero cells? How
to deal with it? Certainly I cannot delete the case, it is so many!

My objective is to find out the existence of the management committee (SRMC)
among public companies.
DV: SRMC (0 or 1)
IV:
1) INDDIR - continuous
2) INDCHAIR - categorical
3) BRDSIZE- continuous
4) DIRSHIP- continuous
5)MEETING- continuous
6) EXPERT- continuous
7) INSTI- continuous
8) DEBT- continuous
9) SIZE- continuous
10) BIG4 - categorical

Many thanks!
--
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