[R] Obtaining summary of frequencies of value occurrences for a variable in a multivariate dataset.

Allan Kamau kamauallan at yahoo.com
Wed Jul 25 12:30:25 CEST 2007

A subset of the data looks as follows

> df[1:10,14:20]
   PR10 PR11 PR12 PR13 PR14 PR15 PR16
1     V    T    I    K    V    G    D
2     V    S    I    K    V    G    G
3     V    T    I    R    V    G    G
4     V    S    I    K    I    G    G
5     V    S    I    K    V    G    G
6     V    S    I    R    V    G    G
7     V    T    I    K    I    G    G
8     V    S    I    K    V    E    G
9     V    S    I    K    V    G    G
10    V    S    I    K    V    G    G

The result I would like is as follows

PR10        PR11          PR12   ...
[V:10]    [S:7,T:3]    [I:10]

The result can be in a matrix or a vector and each variablename, value and frequency should be accessible so as to be used for comparisons with another dataset later.
The frequency can be a count or a percentage.


----- Original Message ----
From: Adaikalavan Ramasamy <ramasamy at cancer.org.uk>
To: Allan Kamau <kamauallan at yahoo.com>
Cc: r-help at stat.math.ethz.ch
Sent: Tuesday, July 24, 2007 10:21:51 PM
Subject: Re: [R] Obtaining summary of frequencies of value occurrences for a variable in a multivariate dataset.

The name of the table should give you the "value". And if you have a 
matrix, you just need to convert it into a vector first.

 > m <- matrix( LETTERS[ c(1:3, 3:5, 2:4) ], nc=3 )
 > m
      [,1] [,2] [,3]
[1,] "A"  "C"  "B"
[2,] "B"  "D"  "C"
[3,] "C"  "E"  "D"
 > tb <- table( as.vector(m) )
 > tb

1 2 3 2 1
 > paste( names(tb), ":", tb, sep="" )
[1] "A:1" "B:2" "C:3" "D:2" "E:1"

If this is not what you want, then please give a simple example.

Regards, Adai

Allan Kamau wrote:
> Hi all,
> If the question below as been answered before I
> apologize for the posting.
> I would like to get the frequencies of occurrence of
> all values in a given variable in a multivariate
> dataset. In short for each variable (or field) a
> summary of values contained with in a value:frequency
> pair, there can be many such pairs for a given
> variable. I would like to do the same for several such
> variables.
> I have used table() but am unable to extract the
> individual value and frequency values.
> Please advise.
> Allan.
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