[R] Yet another help needed

Gabor Grothendieck
Mon, 01 May 2006 02:55:30 -0000

Look at
?filter
?embed
rollmean in the zoo package
running in the gtools package
runmean in the caTools package

The last one is probably the fastest.

On 4/30/06, Guojun Zhu <shmilylemon at yahoo.com>
wrote:
> I have a big data.frame with abou 20 column and 60,000
> rows for analyze.  Let us say I had a column "a".  I
> want to generate a new column which value should be
> the average of the 60 a before the current column.
> Let us say very row is time t_i.  I need to calculate
> a(t_(i-60))+a(t(i-59)+...+a(t(i-1)).  Also I want to
> get another number by run regression of
> a(t(i-60)),..., a(t(i-1)) on b(t(i-60)),...,b(t(i-1)).
>  Is there any simple densed code for this?  Thanks.
>
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