Hi,
You can so something like this
XX <- data.frame(x=1:10,y=rbinom(10,3,0.5))
sapply(XX,rep,XX[,2])
HTH (if this do what you really want)
Thomas
-----Ursprüngliche Nachricht-----
Von: Michael Friendly [mailto:[EMAIL PROTECTED]
Gesendet: Do 25.09.2003 19:14
An: r-help
Cc:
Betreff: [R] ungrouping grouped data
I'm sure this is probably simple, but I can't find an answer...
I have a data frame (Galton's data on heights of parents and children),
in grouped form,
parent child frequency
73.5 72.2 1
73.5 73.2 3
72.5 68.2 1
72.5 69.2 2
72.5 70.2 1
72.5 71.2 2
72.5 72.2 7
72.5 73.2 2
72.5 74.2 4
71.5 65.2 1
71.5 66.2 3
71.5 67.2 4
71.5 68.2 3
71.5 69.2 5
71.5 70.2 10
...
and need the ungrouped equivalent, where each input observation
appears the number of times represented by its frequency. In SAS
this would be
data galton2;
set galton;
do i=1 to frequency;
output;
end;
I can replicate this in R, but surely there must be an easier way.
(In APL2 it would be frequency\[1]galton)
thanks,
-Michael
--
Michael Friendly Email: [EMAIL PROTECTED]
Professor, Psychology Dept.
York University Voice: 416 736-5115 x66249 Fax: 416 736-5814
4700 Keele Street http://www.math.yorku.ca/SCS/friendly.html
Toronto, ONT M3J 1P3 CANADA
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