Dear Zelig users
I am using the R package Zelig for some tobit regression with robust
standard errors.
I have got R version 2.9.2 (2009-08-24)
and Zelig Version: 3.4-5
when i do demo(robust)
It ends like this way
data(coalition)
# Fit the model with robust standard error
user.prompt()
Press <return> to continue:
z.out3 <- zelig(Surv(duration, ciep12) ~ polar +
numst2 + crisis,
model = "weibull", data = coalition, cluster =
"invest", robust = TRUE)
*It is giving the following error
*Error in rowsum.default(resid(fit, "dfbeta"), cluster) :
'x' must be numeric
Please help where it is going wrong
Thanks and Regards
Sayan Dasgupta