search for: pwilcox

How does R compute the p-value in the Wilcoxon Rank Sum Test? If I have the test statistics, can I get the p-value using the function pwilcox? Thanks -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request...

...<- psignrank(z, n) cat("z = ", z, ", n = ", n, ", p = ", p, "\n", sep="") } for (n in seq(100, 1000, 100)) { m <- n mu <- n * m / 2 sigma <- sqrt(m * n * (m + n + 1) / 12) z <- floor(qnorm(0.05, mu, sigma)) p <- pwilcox(z, m, n) cat("z = ", z, ", m = ", m, ", n = ", n, ", p = ", p, "\n", sep="") } A fix is hard because a good solution would free all the previously allocated memory before dying. Probably a better algorithm is needed. But I don't...

...ilcox( (1:2800), 80, 80) ) user system elapsed 0.290 0.020 0.30 > system.time( dwilcox( (1:2800), 160, 160) ) user system elapsed 0.810 0.060 0.868 > system.time( dwilcox( (1:28000), 210, 210) ) user system elapsed 17.700 0.600 18.313 RAM: ~ 700MB > system.time( pwilcox( 21000, 211, 211) ) user system elapsed 18.110 0.640 18.762 > system.time( a <- qwilcox( 0.43, 200, 400) ) ^C Timing stopped at: 14.39 1.43 18.794 RAM: > 1.4GB at interrupt time > system.time( dwilcox(800, 800, 80) ) user system elapsed 0.140 0.000 0.144 > system.t...

Full_Name: Mark J. Lamias Version: 1.7.0 OS: Windows 2000 Pro Submission from: (NULL) (65.222.84.72) I am running the qwilcox procedure and it is producing incorrect results. For example, dwilcox(.025, 3, 5) should equal 6, but it is equal to 1. Similarly, dwilcox(.025, 3, 6) should equal 7, but it equals 2. The critical values are not set being returned with the correct values. I've

I?ve been looking at this for a couple hours--it ended up being trickier than I expected to implement well. I?ve attached a new patch here. This version scales significantly better than the existing method for both `pwilcox` and `dwilcox`. Examples are included below. I can?t think of any other ways to improve runtime at this point. That?s not to say there aren?t any, though?I?m hopeful inspection by someone else could identify more ways to save some time. This version uses Andreas?s algorithm for computing the valu...

Hello, I am hoping someone could shed some light into the Wilcoxon Rank Sum Test for me? In looking through Stats references, the Mann-Whitney U-test and the Wilcoxon Rank Sum Test are statistically equivalent. When using the following dataset: m <- c(2.0863,2.1340,2.1008,1.9565,2.0413,NA,NA) f <- c(1.8938,1.9709,1.8613,2.0836,1.9485,2.0630,1.9143) and the wilcox.test command as

Dear R-ers, I am currently running some Wilcoxon tests in R-64. How do I find the degrees of freedom in the output I am receiving? > wilcox.test(good$TRUE, good$x4a, paired=FALSE) Wilcoxon rank sum test with continuity correction data: good$TRUE and good$x4a W = 2455, p-value < 2.2e-16 alternative hypothesis: true location shift is not equal to 0 Thank you, Stephen.

Hello, can someone please help me with coding a function for a bootstrap WMW test (package boot, R under Windows, version 1.6.2)?

Is it safe to call C code from R that mallocs memory for a structure, returning a pointer to that structure via some 'raw()' parameter. Then, pass that pointer to another C routine, and finally free the malloced memory by passing the raw() data to another C routine? I've written some code that does this, I'm just not sure if anything could go wrong. The worst I can come up

...', respectively. > > Moreover, it is documented that `probabilities are P[X <= x]' and > therefore > > R> qwilcox(.025, 3, 5) + 3*4/2 > [1] 7 > > means "the smallest x with P(W <= x) => 0.025 is 7" which you can check > easily > > R> pwilcox(7 - 3*4/2, 3, 5) > [1] 0.03571429 > > whereas following your calculations > > R> pwilcox(6 - 3*4/2, 3, 5) > [1] 0.01785714 > > Best, > > Torsten > > > 3 6 9 7 > > 3 7 10 7 > > 3 8 11 8 > > 3 9 12 8 > > 3 10 13 9 > > 3 11 14 9 &...

...ct -g -I../include -I../../src/include -c ptukey.c -o ptukey.o gcc -ieee_with_inexact -g -I../include -I../../src/include -c qtukey.c -o qtukey.o gcc -ieee_with_inexact -g -I../include -I../../src/include -c dwilcox.c -o dwilcox.o gcc -ieee_with_inexact -g -I../include -I../../src/include -c pwilcox.c -o pwilcox.o gcc -ieee_with_inexact -g -I../include -I../../src/include -c qwilcox.c -o qwilcox.o gcc -ieee_with_inexact -g -I../include -I../../src/include -c rwilcox.c -o rwilcox.o gcc -ieee_with_inexact -g -I../include -I../../src/include -c dsignrank.c -o dsignrank.o gcc -ieee_with_ine...

...rc/include -c pnf.c cc -ieee_with_inexact -g -I../../src/include -c pnt.c cc -ieee_with_inexact -g -I../../src/include -c ptukey.c cc -ieee_with_inexact -g -I../../src/include -c qtukey.c cc -ieee_with_inexact -g -I../../src/include -c dwilcox.c cc -ieee_with_inexact -g -I../../src/include -c pwilcox.c cc -ieee_with_inexact -g -I../../src/include -c qwilcox.c cc -ieee_with_inexact -g -I../../src/include -c rwilcox.c ar cr ../lib/libmath.a mlutils.o d1mach.o i1mach.o fmax2.o fmin2.o fmod.o fprec.o fround.o ftrunc.o sign.o fsign.o fsquare.o fcube.o imax2.o imin2.o chebyshev.o logrelerr.o l...

...nclude -I../../src/include -c ptukey.c -= o = ptukey.o gcc -ieee_with_inexact -g -I../include -I../../src/include -c qtukey.c -= o = qtukey.o gcc -ieee_with_inexact -g -I../include -I../../src/include -c dwilcox.c = -o = dwilcox.o gcc -ieee_with_inexact -g -I../include -I../../src/include -c pwilcox.c = -o = pwilcox.o gcc -ieee_with_inexact -g -I../include -I../../src/include -c qwilcox.c = -o = qwilcox.o gcc -ieee_with_inexact -g -I../include -I../../src/include -c rwilcox.c = -o = rwilcox.o gcc -ieee_with_inexact -g -I../include -I../../src/include -c dsignrank.= c -o = dsignrank.o gc...

...ude -I../../src/include -c pnt.c -o pnt.o gcc -g -O2 -I../include -I../../src/include -c ptukey.c -o ptukey.o gcc -g -O2 -I../include -I../../src/include -c qtukey.c -o qtukey.o gcc -g -O2 -I../include -I../../src/include -c dwilcox.c -o dwilcox.o gcc -g -O2 -I../include -I../../src/include -c pwilcox.c -o pwilcox.o gcc -g -O2 -I../include -I../../src/include -c qwilcox.c -o qwilcox.o gcc -g -O2 -I../include -I../../src/include -c rwilcox.c -o rwilcox.o gcc -g -O2 -I../include -I../../src/include -c dsignrank.c -o dsignrank.o gcc -g -O2 -I../include -I../../src/include -c psignrank.c -o psig...

...ude -I../../src/include -c pnt.c -o pnt.o gcc -g -O2 -I../include -I../../src/include -c ptukey.c -o ptukey.o gcc -g -O2 -I../include -I../../src/include -c qtukey.c -o qtukey.o gcc -g -O2 -I../include -I../../src/include -c dwilcox.c -o dwilcox.o gcc -g -O2 -I../include -I../../src/include -c pwilcox.c -o pwilcox.o gcc -g -O2 -I../include -I../../src/include -c qwilcox.c -o qwilcox.o gcc -g -O2 -I../include -I../../src/include -c rwilcox.c -o rwilcox.o gcc -g -O2 -I../include -I../../src/include -c dsignrank.c -o dsignrank.o gcc -g -O2 -I../include -I../../src/include -c psignrank.c -o psig...

...-I../include -c qnchisq.c gcc -g -O2 -I../include -c dnbeta.c gcc -g -O2 -I../include -c pnbeta.c gcc -g -O2 -I../include -c pnf.c gcc -g -O2 -I../include -c pnt.c gcc -g -O2 -I../include -c ptukey.c gcc -g -O2 -I../include -c qtukey.c gcc -g -O2 -I../include -c dwilcox.c gcc -g -O2 -I../include -c pwilcox.c gcc -g -O2 -I../include -c qwilcox.c gcc -g -O2 -I../include -c rwilcox.c ar cr ../lib/libmath.a mlutils.o d1mach.o i1mach.o fmax2.o fmin2.o fmod.o fprec.o fround.o ftrunc.o sign.o fsign.o fsquare.o fcube.o imax2.o imin2.o chebyshev.o logrelerr.o lgammacor.o gammalims.o gamma.o lgamma.o bet...

I am a newbie to C (although I did some programming in Perl and Pascal) so forgive me for the language that follows. I am writing because I have a question concerning the *implementation of *(the internal function)* cwilcox* in https://svn.r-project.org/R/!svn/bc/81274/branches/R-DL/src/nmath/wilcox.c. This function is used to determine the test statistics of the Wilcoxon-Mann-Whitney U-test.

Problem compiling R. version: 0.64.2 machine: SGI O2 OS: IRIX6.5 CC cc FC f77 MAKE GNU make 3.75 Here is part of the the output for make. make[2]: Leaving directory `/usr/people/faculty/math/mgass/stage/R/R-0.64.2/src/include' make[2]: Entering directory `/usr/people/faculty/math/mgass/stage/R/R-0.64.2/src/appl' cc -g -OPT:IEEE_NaN_inf=ON -I../include

R-1.7.0 built on NetBSD 1.6, but the validation test suite failed: Machinetype: Intel Pentium III (600 MHz); NetBSD 1.6 (GENERIC) Remote gcc version: gcc (GCC) 3.2.2 Remote g++ version: g++ (GCC) 3.2.2 Configure environment: CC=gcc CXX=g++ LDFLAGS=-Wl,-rpath,/usr/local/lib make[5]: Entering directory `/local/build/R-1.7.0/src/library' >>> Building/Updating