Message-ID: <1204821666.9684.16.camel@martin-laptop>
Date: 2008-03-06T16:41:06Z
From: Martin Kaffanke
Subject: 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
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