R help - Aug 2007 - Robust Standar Errors in Zero-Truncated Poisson

Hi.

I would like to know if is it possible to estimate zero-truncated count
models with robust standard errors in R. In Stata that is possible. I
already made some searches and attempts but not obtained it. In R I made the
estimation of the truncated poisson by the vglm command of VGAM package .
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