Date: Mon, 19 Mar 2012 01:50:37 -0700
Reply-To: vishal <vsuthar28@HOTMAIL.COM>
Sender: "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From: vishal <vsuthar28@HOTMAIL.COM>
Subject: Re: SPSS: random effect in multivariate logistic regression
In-Reply-To: <1331979777654-5573358.post@n5.nabble.com>
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Thanks for the answers.
Do I need to use Syntax for this GENLINMIXED procedure? If yes than would be
nice if you send me the source. I am sending some more detail on my
question.Truly speaking I am not aware of this procedure. It would be nice
of you if you explain step viz. Below I am sending you more detail on my
problem.
My aim is to study prevalence of clinical ketosis (metabolic disease) and
its possible predictors in European dairy herds. Therefore I collected 5012
cow data from 507 herds (median n=15 cows/herd) of 9 different European
countries. For screening potential plausible predictors (independent
factors) of clinical ketosis I used univariate logistic regression (i.e P <
0.20). Therefore I end up with 6 potential predictors.
Dependent and independent variables
Dependent: Clinical Ketosis (0 –No and 1- Yes) (n =201 (4%) having clinical
ketosis out of 5012 cows)
Independent factors:
1. Countries : (9; i.e. 0 to 8)
2. Subclinical ketosis (No- 0 and Yes-1) (n =1194 (23.8%) having sub
clinical ketosis out of 5012 cows)
3. Season (summer -0 and winter -1)
4. Milk yield (continuous variable)
5. Lactation number (1st -0, 2nd- 1 , 3rd - 2 and 4th – 3)
6. Metritis (0- No and 1 - yes) (n =532 (6.4%) having metritis out of
5012 cows)
I would like to include cow herd as a random effect in this model. Using
SPSS > Analysis > Regression > Binary Logistic, I am unable to do that,
correct? I am not sure! Please help me in this matter!
Thanking you in advance
Best regard
Vishal
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vishal suthar
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