[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.
Allan.
----- 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
A B C D E
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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