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olsson
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.
2006 Jan 24
1
non-finite finite-difference value[]
Dear R-helpers,
running a zeroinflated model of the following type:
zinb = zeroinfl(count=response ~., x = ~ . - response, z = ~. - response,
dist = "negbin", data = t.data, trace = TRUE)
generates the following message:
Zero-Inflated Count Model
Using logit to model zero vs non-zero
Using Negative Binomial for counts
dependent variable y:
Y
0 1 2 3
359 52 7 3
generating
2007 Oct 30
2
How to switch off accepting the shortcut of column names
Dear R-users,
currently I am working with the R version 2.4.1.
I realized it has a feature, which might be wonderful (as so many things in
R), but in this case might be a bit dangerous as well. It seems that columns
of a data frame can be called just by indicating the first letter of the
name of the column.
For example:
first_item <- seq(1,10)
second_item <- seq(11,20)
dat <-