[R] Just about "approximate F-test"

[1...@agri521]

Hi, Dear R community,

These is a paper of "Wheat Grain Yield Response to N Application
Evaluated through Canopy Reflectance".

This paper of "Materials and Methods" said "A single regression equation
relating A and B was derived for each location using PROC NLIN (SAS
Inst. 1990). Slopes and intercepts for the independent regressions were
compared with an *approximate F-test* (Mead et al. 1993) to determine if
a single relationship could be used across environments."

I can not understand the "approximate F-test", and I donot know how to
use this test to compare coefficients of regression in R.

Does anyone know that?

Thanks a lot in advance.

-- 
Sincerely
Guoqiang LI
agri...@gmail.com
http://agri520.cn
-- 


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[R] question about stepwise multivariate analysis of variance (stepwise MANOVA)

[1...@agri521]

Hello,

I saw statistical method of stepwise multivariate analysis of variance in 
several literatures.

I now want to how to do it in R software. Thanks in advance!

Guoqiang Li

http://agri520.cn

__
R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.