Running proc logistic with a categorical variable getting 0 as estimate for the parameters, not sure what is wrong with the code.
data tonsils; input virus $ size $ count ; cards; Carrier Normal 19 Carrier Slightly 29 Carrier Very 24 NonCarrier Normal 497 NonCarrier Slightly 560 NonCarrier Very 269 ; proc logistic data=tonsils; class size (ref='Normal') / order=data param=ref ; model virus=size / lackfit cl; output out=predict pred=prob reschi=pearson resdev=deviance; Title "Virus=Tonsil size"; run;
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