# Re: [R] creating bins for a plot

From: Alex Brown <alex_at_transitive.com>
Date: Thu 19 Oct 2006 - 10:53:07 GMT

I suggest you look at the functions cut and tapply.

for instance:

breaks = 0:40 / 40
bucket <- cut(purban2, breaks)
used.c = tapply(used, bucket, sum)
unused.c = tapply(1 - used, bucket, sum) used.c[is.na(used.c)] = 0
unused.c[is.na(unused.c)] = 0
plot(breaks[-length(breaks)], used.c / unused.c)

-Alex Brown

On 18 Oct 2006, at 23:24, Jeffrey Stratford wrote:

> Hi. I'm trying to plot the ratio of used versus unused bird houses
> (coded 1 or 0) versus a continuous environmental gradient
> (proportion of
> urban cover [purban2]) that I would like to convert into bins (0 -
> 0.25, 0.26 - 0.5, 0.51 - 0.75, 0.76 - 1.0) and I'm not having much
> luck
> figuring this out. I ran a logistic regression and purban2 ends up
> driving the probability of a box being occupied so it would be nice to
> show this relationship. I'm also plotting the fitted values vs.
> purban2
> but that's done. Any suggestions would be appreciated.
>
> Many thanks,
>
> Jeff
>
>
> Data sample:
>
> box use purbank purban2
> 1 1 0.003813435 0.02684564
> 2 1 0.04429451 0.1610738
> 3 1 0.04458785 0.06040268
> 4 1 0.06072162 0.2080537
> 5 0 0.6080962 0.6979866
> 6 1 0.6060428 0.6107383
> 7 1 0.3807568 0.4362416
> 8 0 0.3649164 0.3154362
> 9 0 0.3505427 0.2483221
> 10 0 0.3476093 0.1409396
> 11 0 0.3719566 0.3020134
> 12 1 0.09238011 0.1342282
> 13 0 0.08616111 0.1073826
> 14 0 0.07388724 0.04026845
> 15 1 0.07046477 0.03355705
> .
> .
> .
>
>
> ****************************************
> Jeffrey A. Stratford, Ph.D.
> Postdoctoral Associate
> 331 Funchess Hall
> Department of Biological Sciences
> Auburn University
> Auburn, AL 36849
> 334-329-9198
> FAX 334-844-9234
> http://www.auburn.edu/~stratja
>
> ______________________________________________
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R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Thu Oct 19 21:23:40 2006

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