[R] producing a QQ plot.

Stefan Grosse singularitaet at gmx.net
Sat Mar 27 11:24:24 CET 2010

Am 27.03.2010 10:45, schrieb Philip Wong:
>> mah=mahalanobis(data,apply(data,2,mean),var(data))
>> mah=mahalanobis(data,apply(data,2,mean),var(no_fisher))
> qqplot(qchisq(ppoints(data),ncol(data),data)

As Joshua already pointed out: you are trying mathematical functions on
names. Your Data containes e.g. Village names.

You can exclude those with subset, generating a new data.frame.

If you want averages by categories e.g. by a village have a look at the
doby package, it has a function summaryby that is perfect for generating
aggregated data with multiple functions.


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