This is unbelievable. Now people like yourself start doing background searches on one and accusing one of not being professional plus posting cheeky R code. The reason why I submitted the questions I have submitted was that these answers did not satisfy my particular problem (or perhaps I mistakenly thought so). The point here is that the forum should be a forum where one should be allowed to ask questions without first studying the history of the the entire forum in fear that someone might have asked it before. I was hoping that I could find clearer answers then what I was able to read. I do know how to search in Google. But I am not an expert in statistics, as you already found in your background check. If I would be fluent in stastitsics and R and if past answers would have exactly satisfied my problem I would not post here and I certainly would not have occupied your expensive attention.
On Wed, Aug 4, 2010 at 6:16 PM, David Winsemius <dwinsem...@comcast.net> wrote: > > On Aug 4, 2010, at 5:49 PM, Ralf B wrote: > >> Hi R Users, >> >> I have two vectors, x and y, of equal length representing two types of >> data from two studies. I would like to test if they are similar enough >> to use them interchangeably. No assumptions about distributions can be >> made (initial tests clearly show that they are not normal). >> Here some result: >> >> Two-sample Kolmogorov-Smirnov test >> >> data: x and y >> D = 0.1091, p-value < 2.2e-16 >> alternative hypothesis: two-sided >> >> Warning message: >> In ks.test(x[1:nx], y[1:nx], exact = FALSE) : >> cannot compute correct p-values with ties >> >> Here some questions: >> >> a) What does the error message means and what does it imply? >> b) The data is very noisy and the initial result shows that there is >> no relation between x and y. Is there a way to calculate and effect >> size? >> c) Can the p-value be used, when running tests over a large amount of >> different data sets, as a metric for ranking similarity between x and >> y data sets? > > There has been quite a bit of discussion on this list over the years about > why KS test is not good in this situation. If I read the results of a search > on your name correctly, you are in a department of Information Sciences. I > would have thought that the first reaction of someone in that field would be > do do a search on a question. Why are you filling up the archives with > questions that have been repeatedly asked and answered? > > Do you need help in this area? > > rhelpSearch <- function(string, > restrict = c("Rhelp10", "Rhelp08", "Rhelp02", "functions" > ), > matchesPerPage = 100, ...) > RSiteSearch(string=string, restrict = restrict, matchesPerPage = > matchesPerPage, ...) > > > rhelpSearch("KS.test ties p-value") > >> >> Best >> R. >> >> ______________________________________________ >> R-help@r-project.org mailing list >> 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. > > David Winsemius, MD > West Hartford, CT > > ______________________________________________ R-help@r-project.org mailing list 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.