You might want to take a look at this article by WEI, PERE, KOENKER,
AND HE. Its in the research files of Koenker who is a regular
contributor to R-help:
http://www.econ.uiuc.edu/~roger/research/growth/growth.pdf
In particular it mentions lmsqreg, which would be a package that
implements the L M S methodology used by the CDC to produce these
files. the above paper discusses that package as a starting point and
then offers an alternative using quantreg.
The lmsqreg package can be acquired with this code:
install.packages("lmsqreg", repos="http://R-Forge.R-project.org";)
library(lmsqreg)
There is a function, zscores, that might illustrate how to apply the
L, M, S columns in those CDC datasets. You might consider posting on
the Bioconductor list if these queries are unsuccessfl or contacting
Vincent Carey, who is a Bioconductor Core member and appears to have
done quite a bit of work in related areas:
http://biosun1.harvard.edu/~carey/
(I have taken the liberty of correcting the spelling of the subject
line so it can be found on searches more easily. Seems possible that
searching with that alternate spelling might improve your subsequent
searches as well.)
--
David
On Oct 28, 2009, at 3:24 AM, Orvalho Augusto wrote:
Thanks!
Yes I want a program in R that uses that data and produce percentiles
and z-scores. Is there any ready program or not?
Caveman
On Wed, Oct 28, 2009 at 2:16 AM, David Winsemius <dwinsem...@comcast.net
> wrote:
On Oct 27, 2009, at 7:27 PM, Orvalho Augusto wrote:
Hey greate ones, is there any way to have something similar to stata
zanthro on R?
I suppose it is possible that someone will know what is in that stata
package, but it would make more sense if you were to summarize what
features
would be of use.
I want a package that contains functions to give antropometric
values,
at least for the children.
You are perhaps trying to map ht, weight, and head circumference to
age-specific percentiles???
http://www.cdc.gov/growthcharts/percentile_data_files.htm
--
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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