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...Please find attached some example code using the ChickWeight data. Many thanks for your help! Jokel #Chick weight example names(ChickWeight) <- tolower(names(ChickWeight)) sd(ChickWeight$weight) # works fine mean(ChickWeight$weight) # works fine length(ChickWeight$weight) # works fine chick_m <- melt(ChickWeight, id=2:4, na.rm=TRUE) dcast(chick_m, time~variable, mean) # works fine dcast(chick_m, time~variable, length) # works fine dcast(chick_m, time~variable, fun.aggregate=sd) # gives an error dcast(chick_m, time~variable, c(mean, length)) # gives an error [[alternative HTML...

according to the documentation of the cast function in the reshape function, I would expect this bit of code from the examples to calculate marginal means over only the 'diet' variable. #Chick weight example names(ChickWeight) <- tolower(names(ChickWeight)) chick_m <- melt(ChickWeight, id=2:4, na.rm=TRUE) cast(chick_m, diet + chick ~ time, mean, margins="diet") But, summary(cast(subset(chick_m, time == 0), diet + chick ~ time, mean, margins="diet")) returns: diet chick 0 1 :21 (all) : 4 Min. :39...

Hi, In the examples from the ReShape package there is a simple example of using melt followed by cast that produces a smallish amount of output about the chicks database. Here's the code: library(reshape) names(ChickWeight) <- tolower(names(ChickWeight)) chick_m <- melt(ChickWeight, id=2:4, na.rm=TRUE) DietResults <- cast(chick_m, diet + chick ~ time) DietResults My challenge is to extract an plot only a portion of this data. I would like to plot the data for each chick that participated in diet 1 only. Assume that the numbered column names (...