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 -- [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
