thanks, it works! well, now it shows 1s instead of 0s and 2s instead of 1s,
which fine with me...but could you explain me what this function actually
does?
Gabor Grothendieck wrote:
Iff dd is your data frame then:
dd$prev - ave(dd$of, dd$Id, FUN = function(x) c(NA, head(x, -1)))
On
Next time if dd is your data frame display dput(dd) so we know exactly
what you have.
From your output I guessed it was numeric but the behavior of the 0/1
column that you describe is consistent with it being a factor rather
than numeric. Try
dd$of - as.numeric(levels(dd$of)[dd$of])
or
Dear Rlers,
in the following dataset I would like to insert a new column that refers to
the data of the previous row.
My question is whether the probability of a female (Id) changes if she had
given birth to a pup in the previous year. So my dataframe consists of the
column Id, year (2003-2007
Iff dd is your data frame then:
dd$prev - ave(dd$of, dd$Id, FUN = function(x) c(NA, head(x, -1)))
On Wed, Oct 21, 2009 at 2:55 AM, clion birt...@hotmail.com wrote:
Dear Rlers,
in the following dataset I would like to insert a new column that refers to
the data of the previous row.
My
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