Hello, Sorry, resending this question as the prior was not sent properly.
I’m using the plyr package below to add a variable named "bin" to my original data frame "df" with the user-defined function "create_bins". I'd like to get similar results using dplyr instead, but failing to do so. set.seed(4) df <- data.frame(pred = rnorm(100), models = gl(2, 50, 100, labels = c("model1", "model2"))) ### Using plyr (works fine) create_bins <- function(x, nBins) { Breaks <- unique(quantile(x$pred, probs = seq(0, 1, 1/nBins))) dfB <- data.frame(pred = x$pred, bin = cut(x$pred, breaks = Breaks, include.lowest = TRUE)) dfB } nBins = 10 res_plyr <- plyr::ddply(df, plyr::.(models), create_bins, nBins) head(res_plyr) ### Using dplyr (fails) by_group <- dplyr::group_by(df, models) res_dplyr <- dplyr::summarize(by_group, create_bins, nBins) Error: not a vector Any help would be much appreciated. Best, Axel. [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.