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apint
2012 Mar 04
2
Can't find all levels of categorical predictors in output of zeroinfl()
...g zero-inflated Poisson regression via the zeroinfl() function to
analyze data on seed-set of plants, but for some reason, I don?t seem to be
getting the output for all three levels of my two categorical predictors.
More about my data and model:
My response variable is the number of viable seeds (AVInt), and my two
categorical predictors are elevation (Elev) and Treatment (Treatment). Elev
has three levels: 01-Low, 02-Mid, and 03-High; Treatment also has three
possibilities: B, F, or O.
Because the response variable (AVInt) is zero-inflated and
Poisson-distributed, I?m using zeroinfl() under t...