Re: [R] Odp: mean and sd with number of values?

From: Petr PIKAL <petr.pikal_at_precheza.cz>
Date: Fri, 07 Mar 2008 14:55:53 +0100

Hi

Martin Kaffanke <technik_at_roomandspace.com> napsal dne 06.03.2008 18:05:03:

>
> Am Donnerstag, den 06.03.2008, 17:47 +0100 schrieb Petr PIKAL:
> > Hi
> >
> > r-help-bounces_at_r-project.org napsal dne 06.03.2008 17:41:06:
> >
> > > Hi there,
> > >
> > > When i do
> > >
> > > mean(fl[1:20], na.rm=T)
> >
> > e.g.
> >
> > sum(!is.na(fl[1:20]))
>
> This seems to give me a sum of all the items.
>
> But I'd like to have it per column.
>
> > mean(fl[1:20])
> aids angststoer autismus bauchspduekrebs
> prostata
> -0.7474884 -1.0475500 -0.6267267 NA
> -1.7318179
> fraudep manndep hautkrebs herzinfarkt
> leukaemie
> -1.2919841 -1.5124280 -0.3202036 -0.8246589
> 0.7550549
> lungenkrebs manischdepresiv magenkrebs magersucht
> mannmagsucht
> -1.2451753 -1.9726160 1.4548394 -0.6242250
> NA
> osteoporose panik schizophrenie schlaganfall
> zwangsstoer
> -1.7974270 NA -1.8634089 NA
> -1.5056106
>
> > mean(fl[1:20], na.rm=T)
> aids angststoer autismus bauchspduekrebs
> prostata
> -0.7474884 -1.0475500 -0.6267267 1.2168804
> -1.7318179
> fraudep manndep hautkrebs herzinfarkt
> leukaemie
> -1.2919841 -1.5124280 -0.3202036 -0.8246589
> 0.7550549
> lungenkrebs manischdepresiv magenkrebs magersucht
> mannmagsucht
> -1.2451753 -1.9726160 1.4548394 -0.6242250
> -0.3765245
> osteoporose panik schizophrenie schlaganfall
> zwangsstoer
> -1.7974270 -1.2328361 -1.8634089 -1.7165059
> -1.5056106
>
> > sum(!is.na(fl[1:20]))
> [1] 892

Then why not compute it across columns either by apply or by colSums

apply(!is.na(fl), 2, sum)
colSums(!is.na(fl))

Regards
Petr

>
> So I'd like to have it like the mean, to see how many data is calculated
> by na.rm=T per column?
>
> Thanks,
> Martin
> [příloha signature.asc odstraněna uživatelem Petr PIKAL/CTCAP]



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