search for: herbicid

..., 0.05861799, 1.73290589, 0.38153146, 0.24316978) ## No error m1 <- nlme(SLOPE ~ c + (d-c)/(1+exp(b*(log(DOSE)-log(e)))), fixed = list(b+c+d+e~1), random = d~1|CURVE, start = sv[c(2:5)], data = PestSci) ## No error m2 <- nlme(SLOPE ~ c + (d-c)/(1+exp(b*(log(DOSE)-log(e)))), fixed = list(b~HERBICIDE, c+d+e~1), random = d~1|CURVE, start = sv[c(1:5)], data = PestSci) ## Error in R 2.4.1! m3 <- nlme(SLOPE ~ c + (d-c)/(1+exp(b*(log(DOSE)-log(e)))), fixed = list(b~factor(HERBICIDE)-1, c~1, d~1, e~factor(HERBICIDE)-1), random = d~1|CURVE, start = sv, data = PestSci) Error in dimnames(data) &l...

...count for this (but if so, the terms are not laid out in a way that makes for ready interpretation. The design is such (two locations) that you do not have much of a check that effects are consistent over locations. You need to check whether results really are similar for all cultivars and for all herbicides, so that it is legitimate to pool as happens in the overall analysis. If a herbicide:cultivar combination has little effect the variability may be large, while if it has a dramatic effect (kills everything!), there may be no variability to speak of. John Maindonald. On 22 Feb 2005, at 10:06 PM,...

This question will probably get me in trouble on theoretical grounds, but I will pose it anyway. The situation: I recently ran a field study looking for differences in sugarbeet cultivar tolerance to a specific herbicide. The study was set up so that 37 cultivars were treated with 4 different applications of the herbicide (37*4 factorial). In doing so, we found that the interaction effect was highly insignificant (ndf=108, ddf=144, F=0.28, p=1.0000). Now my problem is this... the study takes up an enormous amou...

...list(b+c+d+e~1), random = d~1|CURVE, start = sv[c(2,3,4,5)], data = PestSci) ## Error: attempt to select more than one element m2 <- nlme(SLOPE ~ c + (d-c)/(1+exp(b*(log(DOSE)-log(e)))), fixed = list(b~HERBICIDE, c+d+e~1), random = d~1|CURVE, start = sv, data = PestSci) Output from sessionInfo() for R 2.4.0 alpha R version 2.4.0 alpha (2006-09-16 r39365) i386-pc-mingw32 locale: LC_COLLATE=Danish_Denmark.1252;LC_CTYPE=Danish_Denmark.1252;LC...

...ser interface to help. Type 'q()' to quit R. > library(drc) Loading required package: MASS > library(drc) > choose.files() [1] "D:\\R\\EPTC.csv" > mydata<- read.csv ("D:\\R\\EPTC.csv", sep=",", dec=".", header=TRUE) > mydata Dose Herbicide Survival 1 0.00 EC 100.00000 2 1.23 EC 89.76064 3 2.46 EC 59.84043 4 3.69 EC 29.92021 5 4.92 EC 33.24468 6 0.00 EC 100.00000 7 1.23 EC 96.55172 8 2.46 EC 37.93103 9 3.69 EC 30.34483 10 4.92 EC 27.58621 11 0.00...

Dear all I have an experiment where plots either have or have not regrown (in 40 plots) after receiving 12 different herbicide treatments and a control (no treatment). The data are significant with a Chi2, but to later distinguish if the differences are significant between each of the 12 treatments apart I need to do multiple Chi2 s between each. Is there a way to run those multiple Chi2 or something like them so that eac...

Hello everybody, I'm testing the randomForest package in order to do some simulations and I get some trouble with the prediction of new values. The random forest computation is fine but each time I try to predict values with the newly created object, I get an error message. I thought I was because NA values in the dataframe, but I cleaned them and still got the same error. What am I

Why is R recognizing dates like this? Chris Buddenhagen, Botany Department, Charles Darwin Research Station, Santa Cruz,Galapagos. Mail: Charles Darwin Foundation, Casilla 17-01-3891 Avenida 6 de Diciembre N36-109 y Pasaje California Quito, ECUADOR ______________________________________________________________________ EL CONTENIDO DE ESTE MENSAJE ES DE ABSOLUTA RESPONSABILIDAD DEL