Re: [R] centile reference chart / clildren growth chart - what package/method to use

2007-11-08 Thread Niels Steen Krogh
Thanks. So with kid.weights I will have (see below) - or is my example use of quantreg wrong? """ #growth_chart_create.R library(UsingR) library(quantreg) lbs_to_kg<-1/2.2046 inch_to_cm<-2.54 data(kid.weights) data_kids<-kid.weights data_kids$weight_kg<-kid.weights$weight*lbs_to_kg data_kids$length

Re: [R] centile reference chart / clildren growth chart - what package/method to use

2007-11-08 Thread John Kane
I think you have the reference for the lmreg package wrong. It looks like it is Carey VJ. LMSqreg: An R package for Cole–Green reference centile curves, 2002, http://www.biostat.harvard.edu/∼carey. The package seems to be available at http://www.biostat.harvard.edu/~carey/vcwww_4.html --- Niels

Re: [R] centile reference chart / clildren growth chart - what package/method to use

2007-11-08 Thread roger koenker
The lmsqreg package is by Vince Carey and is available from his website. There is an independent package with fortran routines from Tim Cole. Both packages implement the LMS method of Cole and Green. You might also want to consider alternative methods: an approach based on nonparametric qu

[R] centile reference chart / clildren growth chart - what package/method to use

2007-11-08 Thread Niels Steen Krogh
We are constructing growth charts (age/weight and age/length) for children with diagnosis that impacts weight/length. But we we don't know how to use R for producing growth charts. We are collection data of Age, Weight and Length. The data are used to produce diagnosis-specific Growth charts (l