Odp: mean and sd with number of values?

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

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
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