[R] Model II regression

[David L Carlson]

Look at package smatr. It fits RMA (called here standardized major axis) regression, plots the line, and provides confidence limits. 

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David L Carlson
Associate Professor of Anthropology
Texas A&M University
College Station, TX 77843-4352



-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of JEAN-LOUIS HEMPTINNE
Sent: Friday, June 24, 2011 10:18 AM
To: r-help at r-project.org
Subject: [R] Model II regression

Hello,
I am using function lmodel2 to calculate RMA regression between
life-history traits in ladybirds beetles. It works well but I am not able
to plot an RMA regression line on the scatterplot of my data. I am of
course unable to plot the confidence intervals. For ordinary least square
regression abline(lm(x~y))works well but for RMA regression,
abline(lmodel2(x~y))does not do it. 
If somebody knows how to do it, it would be a great relief !!
Best wishes,
JL

Jean-Louis Hemptinne
PR Ecologie et Didactique de l'Ecologie
Université de Toulouse - Ecole nationale de Formation agronomique
UMR CNRS 5174 Evolution et Diversité biologique
BP 22687
F-31326 Castanet-Tolosan Cedex

Tel : (+33)0561753295 
Fax : (+33)0561750309

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