search for: response1

Dear all, I want to manipulate a character string such as ex<-"cbind(data$response1,data$response2)" in R in two ways: 1) extracting the "response1" portion of ex 2) replacing "$" with "." I am wondering that is it possible efficiently doing these in R? Best Ozgur -- View this message in context: http://r.789695.n4.nabble.com/two-questio...

Hello! I would like to draw a graph like the following: http://www.optics.rochester.edu/workgroups/cml/opt307/spr04/pavel/plot_small.jpg Aim is to plot confidence intervals of treatments for X(=response1) and Y(=response2) axis simultaneously to visualize aggreement of confidence interval for two responses. Can anyone please provide me some direction to start with? Thanks! -- Kim. [[alternative HTML version deleted]]

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Hi all, I would like to calculate the area under the ROC curve for my predictive model. I have managed to plot points giving me the ROC curve. However, I do not know how to get the value of the area under. Does anybody know of a function that would give the result I want using an array of specificity and an array of sensitivity as input? Thanks, Olivier -- View this message in context:

...correct model specification is an ANCOVA design(?) I can fit this model in MINITAB using, say: glm response = cluster; covariate predictor1 predictor2 ... predictor7. In R, if I specify the model using cluster<-ordered(clusterlevels=c("Low","High")) Model<-lm(predictor~response1+response2+ ... response7+cluster) I can replicate the results from MINITAB, getting identical P and t values when I do summary(lm(Model)), but the F values are all different (huge) when I do summary(aov(Model)) for all correlates. The F value for the fixed effect is correct. The P values for summa...