[R-sig-Epi] Data.Frame Desaggregation

[Ross Darnell]

Ribeiro

Why not (modified df1)

> df1 <- data.frame(Y=c(3,1,1,2),m=c(3,4,3,2))
> df1
  Y m
1 3 3
2 1 4
3 1 3
4 2 2

> df1[rep(row.names(df1),rep(3,dim(df1)[1])),]

    Y m
1   3 3
1.1 3 3
1.2 3 3
2   1 4
2.1 1 4
2.2 1 4
3   1 3
3.1 1 3
3.2 1 3
4   2 2
4.1 2 2
4.2 2 2

Ross Darnell



-----Original Message-----
From: r-sig-epi-bounces at stat.math.ethz.ch [mailto:r-sig-epi-bounces at stat.math.ethz.ch] On Behalf Of Márcio Ribeiro
Sent: Monday, 5 November 2007 3:29 AM
To: r-sig-epi at stat.math.ethz.ch
Subject: [R-sig-Epi] Data.Frame Desaggregation

Hi Listers,

I am trying to transform the data.frame above in a more detailed data.frame... I checked a example at the website, but I didn't understand at all.
                    
data.frame(x = with(df1, rep(x, m)))
What does the df1 means...

My data looks like this...
    Y  m   X1    X2
  1   3   3 12.0   0.8
  2   1   4   4.1  67.5
  3   1   3  2.4   12.4
  4   2   2 11.2    7.7

My object is to obtain this...
     Y  m   X1    X2
 1   1  . 12.0    0.8
 1   1  . 12.0    0.8
 1   1  . 12.0    0.8
 2   1  .  4.1   67.5
 2   0  .  4.1   67.5
 2   0  .  4.1   67.5
 2   0  .  4.1   67.5
 3   1  .  2.4   12.4
3   0  .  2.4   12.4
 3   0  .  2.4   12.4
 4   1  . 11.2    7.7
 4   1  . 11.2    7.7

 Thanks in advance,

Ribeiro


       
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