On 09/28/2010 02:34 AM, Jonas Josefsson wrote:
I have a two-column table as follows where age is in the 1st column and
the number of individuals is in the 2nd.
age;no
1;21
2;31
3;9
4;12
5;6
Can I use mean() and sd() to calculate the mean and standard deviation
from this or do I have to manually multiplicate 21*1+31*2 etc. / N?
Hi Jonas,
You can also use weighted.mean:
weighted.mean(age,no)
Jim
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