Good afternoon
 
I have what I hope is a simple logistic regression issue.
 
I started with 44 independent variables and then used the drop1,
test="chisq" to reduce the list to 8 significant independent variables.  
 
drop1(sep22lr, test="Chisq") and wound up with this model:
 
Model: MIN_Mstocked ~ ORG_CODE + BECLBL08 + PEM_SScat + SOIL_NUTR +
cSEEDSRCE_SW + cMSP + ceFFP + cEXT_Cold
 
4 of the remaining variables are categorical and 4 are continuous.
 
However, when I run a glm and then a summary on the glm - some of the
categorical data is missing from the output.  
 
The PEM_SScat is missing only one variable ... the BECLBL08 is missing
several variables ... the ORG_CODE is missing 4 .. and the SOIL_NUTR is
missing 1 variable.
 
It seems arbitrary to the number of variables missing.  Is there something
wrong with my syntax in calling the logistic model?  Am I not understanding
the inputs correctly?   
 
Any help would be appreciated.
 
Darin Brooks
Geomatics/GIS/Remote Sensing Coordinator
Kim Forest Management Ltd. Cranbrook Office
Cranbrook, BC
www.kfm.ca <http://www.kfm.ca/> 
 
 

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