[R] Antropometrics with R

[David Winsemius]

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 <dwinsemius at 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