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....8 405.5 ET2 112.0 382.6 ET2 149.7 361.8 ET2 187.4 347.7 To do a straightforward nls on the data, some code like this would be necessary... char<-read.table("O:/R_STH/L_TBA/P_IndSer/IntLive/Ilem_Research/Matt/Incubat ion/Desorption Isotherms/RWork/DPIAds.txt", header=TRUE) library(NLS) test1<-nls(SorbedT~A + B/(1 + D*ExtrVol2), data=char, start=list(A=200,B=80, D=0.003),trace=TRUE) summary(test1) Given this code, How do I alter it to group regression based on the factor TimeTreat, and provide a comparison of the...