From: Alex Brown <alex_at_transitive.com>

Date: Thu 19 Oct 2006 - 10:53:07 GMT

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

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
**>
**> ______________________________________________
**> 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.
*

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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