[R] mice and Date-Time Classes
Uwe Ligges
ligges at statistik.tu-dortmund.de
Mon Jul 20 10:50:52 CEST 2009
Andreas Wittmann wrote:
> Dear R-Users,
>
> i want to use the function mice of the mice package with data, that
> contains dates, but this gives an error
>
> x <- Sys.time()
> dat <- data.frame(dates=(1:10)*60*60*24+x, size=rnorm(10))
> dat$dates[c(3,7)]<-NA
>
> mice(dat)
>
> Fehler in check.imputationMethod(imputationMethod,
> defaultImputationMethod, :
> The following functions were not found: mice.impute.
>
> I guess the mice package is not implemented for the POSIXt data class yet.
> A workaround could be to build time intervals and use mice with that and
> transform it back afterwards. Or is there a more efficient way?
I think you are completely right.
You may want to provide a method for the mice maintainer who will
certainly be happy about your contribution.
Best,
Uwe Ligges
> Many thanks if anyone could tell me what i do wrong and what is the
> problem here.
>
> best regards
>
> Andreas
>
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