Displaying 1 result from an estimated 1 matches for "poisson_glm".
2006 Jan 18
4
negative predicted values in poisson glm
Dear R helpers,
running the following code of a glm model of the family poisson, gives
predicted values < 0. Why?
library(MASS)
library(stats)
library(mvtnorm)
library(pscl)
data(bioChemists)
poisson_glm <- glm(art ~ fem + mar + kid5 + phd + ment, data = bioChemists,
family = poisson)
predicted.values = predict(poisson_glm)
range(predicted.values)
Thank you in advance for any hints.
Best regards,
P. Olsson
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