On 2/25/10, Liviu Andronic <landronim...@gmail.com> wrote:
> I can reproduce the error on a modified example from the vignette:
> > require(plm)
> > data("Hedonic")
> > Hed <- pvcm(mv ~ crim + zn + indus + chas + nox + rm + age + dis +rad +
> tax + ptratio + blacks + lstat, Hedonic, model = "within",index = "townid")
> Error in FUN(X[[1L]], ...) : insufficient number of observations
> > ##it fails for both FE and RE cases
> > Hed <- pvcm(mv ~ crim + zn + indus + chas + nox + rm + age + dis +rad +
> tax + ptratio + blacks + lstat, Hedonic, model = "random",index = "townid")
> Error in FUN(X[[1L]], ...) : insufficient number of observations
>
A quick update, the function pooltest() used via its formula interface
fails in a similar way:
> pooltest(mv ~ crim + zn + indus + chas + nox + rm + age + dis +rad + tax +
> ptratio + blacks + lstat, Hedonic, model = "within",index = "townid")
Error in FUN(X[[1L]], ...) : insufficient number of observations
> pooltest(mv ~ crim + zn + indus + chas + nox + rm + age + dis +rad + tax +
> ptratio + blacks + lstat, Hedonic, model = "pooling",index = "townid")
Error in FUN(X[[1L]], ...) : insufficient number of observations
Liviu
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