[R] tables

[Phil Spector]

Erin -
    Here's a reproducible example that should help 
answer your question:

> set.seed(17)
> df = data.frame(a=sample(letters[1:5],250,replace=TRUE),
+                 b=sample(c('A','B'),250,replace=TRUE))
> tt = table(df$a,df$b)
> 100 * prop.table(tt)   # total of all percentages = 100

        A    B
   a 11.2  9.2
   b 12.0  6.8
   c  7.2 10.4
   d 10.8 13.2
   e  8.4 10.8
> 100 * prop.table(tt,1)   # total of row percentages = 100

            A        B
   a 54.90196 45.09804
   b 63.82979 36.17021
   c 40.90909 59.09091
   d 45.00000 55.00000
   e 43.75000 56.25000
> 100 * prop.table(tt,2)   # total of column percentages = 100

            A        B
   a 22.58065 18.25397
   b 24.19355 13.49206
   c 14.51613 20.63492
   d 21.77419 26.19048
   e 16.93548 21.42857

 					- Phil Spector
 					 Statistical Computing Facility
 					 Department of Statistics
 					 UC Berkeley
 					 spector at stat.berkeley.edu


On Mon, 21 Jun 2010, Erin Hodgess wrote:

> Dear R People:
>
> I have generated the following table:
>
>> table(zza$DEATH,zza$GENDER)
>
>               F   M
>  2009-04-21   0   1
>  2009-04-22   4   2
>  2009-04-24   6   0
>  2009-04-25   1   3
>  2009-04-26   2   0
>  2009-04-28   3   0
>  2009-04-29   2   2
>
> However, instead of total counts in the F and M columns, I would like percents.
>
> How would I do this, please?
>
> thanks,
> Erin
>
>
>
> -- 
> Erin Hodgess
> Associate Professor
> Department of Computer and Mathematical Sciences
> University of Houston - Downtown
> mailto: erinm.hodgess at gmail.com
>
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