mean and sd with number of values?

Hi there,

When i do 

mean(fl[1:20], na.rm=T)
sd(fl[1:20], na.rm=T)

I get 20 Results, but now I'd like to know from how many numbers my mean
and sd are calculated.

How to I use the length() for this, or is this possible?

Because there are missing values in some, but not in all columns.  So
there should be a different count of numbers.

Thanks,
Martin

Ihr Partner f?r Webdesign, Webapplikationen und Webspace.
http://www.roomandspace.com/
Martin Kaffanke +43 650 4514224
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