search for: ranksum

...Wilcox.test between columns 1-3 and 4-12. However, I keep getting an error message. The data files is attached. Any suggestion? Thank you. Rong Error message: +?? return c$p.value Error: unexpected symbol in: "? c <- wilcox.test(a[g1], a[g2]) ? return c" Execution halted Scrip:ranksum <- function(a){ ? g1 <- c(1, 2, 3) ? g2 <- c(4, 5, 6, 7, 8, 9, 10, 11, 12) ? c <- wilcox.test(a[g1], a[g2]) ? return c$p.value } data1 <- data.frame() data1 <- read.table("test.txt", sep="\t", header=T) p <- apply(data1, 1, ranksum) write.table(p, file=&quo...

Dear all, I try to compare the performances of several parameters to diagnose lameness in dogs. I have several ROC curves from the same dataset. I plotted the ROC curves and calculated AUC with the ROCR package. I would like to compare the AUC. I used the following program I found on R-help archives : From: Bernardo Rangel Tura Date: Thu 16 Dec 2004 - 07:30:37 EST

...n huge dataset based on their attribute values. The dataset consisted hundreds of thousands of URLs and each url consisted of around 33000 features and a binary class label with +1 OR -1 value. I applied the Decision Tree induction(GINI INDEX) Approach for filtering out the URLs and then applying a RANKSUM[1] metric, which uses weighted sum approach, to rank the URLs accordingly. The current implementation involves firstly the unsupervised ranking of a query and then applying a supervised learning algorithm, SVM, on the first 'n' documents retrieved. A similar approach can be incorporated wh...