[R] Error Message Comes from the Vuong Function

[mikezhaow]

I want to compare the poisson and the zero-inflated poisson distribution on
describing the data.  So, after using the GLM and the ZEROINFL function, I
used the Voung function to compare them.  Here is my code:

library(pscl)
glm1 <- glm(nmer9_1[, 1] ~ 1, family = poisson)
zip <- zeroinfl(nmer9_1[, 1] ~ 1)
vuong(glm1, zip)

However, R returns the following error message:
"Error: cannot allocate vector of size 3.3 Gb."

Would you please tell me what was happening there?  Please note that I am
not trying to do a regression, but only want to compare which of the
distributions explain the data better.

Thank you.

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