[R] Yet another help needed

From: Guojun Zhu <shmilylemon_at_yahoo.com>
Date: Mon 01 May 2006 - 12:31:35 EST

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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