I have done ancova with categorical and continuous predictor variables.
The categorical predictor variable shows significant effect on the dependent
variable.
I would like to do a post-hoc test to see which groups in the categorical
variable differ.
I have explored Tukey test in multcomp package.
I am using glm.nb, a ~b*c ( b is categorical and c is continuous). when I
run this model I get the warning message:
Warning messages:
1: In theta.ml(Y, mu, sum(w), w, limit = control$maxit, trace =
control$trace :
iteration limit reached
2: In theta.ml(Y, mu, sum(w), w, limit = control$maxit,
I am using glm.nb, a ~b*c ( b is categorical and c is continuous). when I
run this model I get the warning message:
Warning messages:
1: In theta.ml(Y, mu, sum(w), w, limit = control$maxit, trace =
control$trace :
iteration limit reached
2: In theta.ml(Y, mu, sum(w), w, limit = control$maxit,
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