R help - Nov 2009 - tapply function

Hi,

I tried to use tapply function to find the mean of the data?in each group as the
following command, but the result are NA, as there are several missing values in
each group.

tapply(data,group,mean)

Could someone please advice me the way to ?ignore the missing data in order for
the fucntion to run successfully?

Thanks

Fir

you must have missing values in "data". Try

tapply(data, group, mean, na.rm = TRUE)

If that's not the case, read the bottom of this email about the posting
guide.

HTH,

--sundar

On Tue, Nov 3, 2009 at 5:28 AM, FMH <kagba2006 at yahoo.com>
wrote:
> Hi,
>
> I tried to use tapply function to find the mean of the data?in each group
as the following command, but the result are NA, as there are several missing
values in each group.
>
> tapply(data,group,mean)
>
> Could someone please advice me the way to ?ignore the missing data in order
for the fucntion to run successfully?
>
> Thanks
>
> Fir
>
>
>
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>