Hi:
I am using step.glm() as follows:
form1 <- as.formula(haspdata ~ 1)
lg.mod1 <- glm ( formula=form1, data=st.mtx,
family=binomial , na.action=na.omit )
upper <- as.formula( haspdata ~ (
c5+childnm+educ1+incpov1+marital+msa+racekid+racemom+sex+shotcard )^2)
lower <- as.formula(haspdata~1)
lst <- list( upper=upper , lower=lower )
form1a.step <- step(lg.mod1, scope=lst , trace=T ,
direction="both" )
I get the following error message in R:
Error in factor.scope(ffac, list(add = fadd, drop = fdrop)) :
upper scope does not include model
Because I am trying to migrate from Splus to R, I ran that same code in
Splus and do not get an error.
Could someone please tell me:
1) what I'm doing wrong in R, and
2) what the distinction between R and Splus is in this case.
Thank you,
Philip J. Smith, PhD
Centers for Disease Control and Prevention
National Immunization Program
Immunization Services Division
MS E-32
1600 Clifton Road, NE
Atlanta, GA 30333
ph: 404 639 8729
fax: 404 639 3266
[EMAIL PROTECTED]
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