[R] Mean(s) from values in different row?

[David Winsemius]

On Oct 7, 2011, at 2:45 AM, Petr PIKAL wrote:

> Hi
>
>>
>> Hello:
>>
>> Is there a way to get a mean from values stored in different rows?
>>
>> The data looks like this:
>>  YEAR-1, JAN, FEB, ..., DEC
>>  YEAR-2, JAN, FEB, ..., DEC
>>  YEAR-3, JAN, FEB, ..., DEC

The details of datA entry may need to be fleshed out. MORE SPEFIC ADVICE

>>
>> What I want is the mean(s) for just the consecutive winter months:
>>  YEAR-1.DEC, YEAR-2.JAN, YEAR-2.FEB
>>  YEAR-2.DEC, YEAR-3.JAN, YEAR-3.FEB
>>  etc.
>
> Isn't colMean(yourdata) what you want?

Perhaps:

colMeans( dat[ , c("JAN", "DEC", "FEB")] )

-- 

David Winsemius, MD
West Hartford, CT