I suspect Massimo meant to refer to the output z as "critical ratio," vs. "critical value." But I agree with Massimo there's no interpretation of it with an exact test. The p-value is the meaningful output.
Pat On Fri, Jun 7, 2019 at 5:40 AM Duncan Murdoch <murdoch.dun...@gmail.com> wrote: > > On 07/06/2019 3:08 a.m., massimo bressan wrote: > > given this reproucible example > > > > library(coin) > > > > independence_test(asat ~ group, data = asat, ## exact null distribution > > distribution = "exact") > > > > I'm wondering why the default results are reporting also the critical value > > Z by considering that this method is supposed to be "exact", i.e. computing > > the direct probability: > > I don't think that is the critical value, I think it is the observed > value of the statistic being used. > > > > pvalue(independence_test(asat ~ group, data = asat, ## exact null > > distribution distribution = "exact")) > > > > my question is: what is the correct interpretation (if it exists at all) of > > the Z value printed out by the 'plain' function 'independence_test' when it > > is asked for an 'exact' test? > > Simply the value of the the statistic. I don't know its formula, but > presumably one of the references in the help page ?independence_test > would give it. > > The p-value is the probability of such a value or a more extreme one > (possibly with some sort of continuity correction; you'd have to check > the references). The "exact" argument says to use the exact permutation > distribution for the statistic when calculating that probability. > > Duncan Murdoch > > > > > > am I completely out of track? > > > > sorry but I'm here missing the point somewhere, somehow... > > > > thank you for the feedback > > > > [[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. > > > > ______________________________________________ > 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. ______________________________________________ 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.
