[R] plotting percent of incidents within different 'bins'

[BXC (Bendix Carstensen)]

You want:

tapply( Outcome, predictor, mean )

Bendix Carstensen
----------------------
Bendix Carstensen
Senior Statistician
Steno Diabetes Center
Niels Steensens Vej 2
DK-2820 Gentofte
Denmark
tel: +45 44 43 87 38
mob: +45 30 75 87 38
fax: +45 44 43 07 06
bxc at steno.dk
www.biostat.ku.dk/~bxc
----------------------



> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of 
> Stephen Choularton
> Sent: Wednesday, January 05, 2005 8:35 PM
> To: R Help
> Subject: [R] plotting percent of incidents within different 'bins'
> 
> 
> Hi
>  
> Say I have some data, two columns in a table being a binary 
> outcome plus a predictor and I want to plot a graph that 
> shows the percentage positives of the binary outcome within 
> bands of the predictor, e.g.
>  
>  
> Outcome           predictor
>  
> 0                      1
> 1                      2
> 1                      2
> 0                      3          
> 0                      3
> 0                      2          
> 1                      3
> 1                      4
> 1                      4
> 0                      4
> 0                      4
> 0                      4
> etc
>  
> In this case there are 4 cases in the band 1 - 2 of the 
> predictor, 2 of them are true so the percent is 50% and there 
> are 7 cases in the band 3
> - 4, 3 of which are true making the percentage 43% .
>  
> Is there some function in R that will sum these outcomes by 
> bands of predictor and produce a one by two  data set with 
> the percentages in one column and the ordered bands in the 
> other, or alternately is there some sort of special plot.???? 
> that does it all for you?
>  
> Thanks
>  
> Stephen
>  
>  
> 
> 	[[alternative HTML version deleted]]
> 
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