Dear Allstat,

I am doing logistic regression 

before i do logistic regression. i did some descriptive statistic

death is outcome

N=450

covariate :- age (continuous), gender (2 group), HTN(2 group), PDM(2 group), 

                  PMI(2 group) , ACS(3 group), bif(4 group), GEN(2 group)

for descriptive statistics , i did chi-square test GEN is related to covariate

from that i found ACS and HTN are statistically significant to GEN,

when i do the backward logistic regression 

1) is it correct include ACS , HTN and GEN in the model

  or do i have to only include one of these above variable?

2)When i do the logistic regression i include all the variable in the 

  model final model include ACS and GEN

if this two variable are related to each others then there is collinearity  is present?

i really need step-wise advice what i am doing correct?

appreciate any advise, 

thanks 

paaveen

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