On Jan 23, 2011, at 2:07 PM, Denis Kazakevich wrote:
Dear David
Thank you for your e-mail
I believe that equivalent to Stata egen tag is simply
df$tag <- df[!duplicated(df[c("station","week")]),]
I am not sure about
egen count
It might be something like
aggregate(station~week, df, function(x)sum(!is.na(x)), na.action =
na.pass)
I made this question while making very first steps in R after
actively using
Stata for 3 years. And I underestimated the extent of flexibility
of R. But
after your answer on one of my previous questions I realized that I
can use,
for instance mean(tapply(<sth>)) or table(<sth>)/<sth> right away
which is great
As I was reading I wondered if the "count" solution might be something
like:
tapply(df$item , df$category, length)
or for a condition:
tapply(df$item , factor( df$variable > const) , length)
Which gives you similar applicability as table
With best regards
Denis
----- Original Message ----
From: David Winsemius <dwinsem...@comcast.net>
To: Denis Kazakevich <den2...@yahoo.com>
Sent: Sun, 23 January, 2011 17:56:53
Subject: Re: [R] Equivalent to Stata egen tag
On Jan 16, 2011, at 6:48 PM, Denis Kazakevich wrote:
What are the R equivalents to the Stata command egen tag
and
egen count?
egen station_week_tag = tag(station week)
I have looked at similar questions in the past and gone to the Stata
online docs
and tried to make some sense of them and even posted an attempt at
an answer.
The documents appeared to be to be fairly cryptic. Much more so that
the R
documentation. I was somewhat snottily informed by experienced Stata
users that
I had completely misunderstood the documentation and that egen was
much more
rich an varied that I understood. So I've given answering Stata
questions. Given
the protean nature of the egen I think it's unrealistic of you to
expect that
just posting code will communicate what you intended.
--
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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