This is my first post to the mailing list and I guess it's a pretty stupid question but I can't figure it out. I hope this is the right forum for these kind of questions.
Before I started using R I was using STATA to run a Wilcoxon signed-rank test on two variables. See data below: https://spreadsheets.google.com/pub?key=0ApodAA2GAEP_dDZkdzZHSFBqX1JHOWJBX1dMQUZCVkE&hl=en&output=html<%20%20https://spreadsheets.google.com/pub?key=0ApodAA2GAEP_dDZkdzZHSFBqX1JHOWJBX1dMQUZCVkE&hl=en&output=html> STATA Output: . signrank x=y Wilcoxon signed-rank test sign | obs sum ranks expected -------------+--------------------------------- positive | 41 3101 2330.5 negative | 18 1560 2330.5 zero | 49 1225 1225 -------------+--------------------------------- all | 108 5886 5886 unadjusted variance 106438.50 adjustment for ties -282.38 adjustment for zeros -10106.25 ---------- adjusted variance 96049.88 Ho: transfer_2_a = transfer_2_b z = 2.486 Prob > |z| = *0.0129* When running a Wilcoxon signed-rank test > wilcox.test(datablatt$x, datablatt$y) Wilcoxon rank sum test with continuity correction data: datablatt$x and datablatt$y W = 7059.5, p-value = *0.09197* alternative hypothesis: true location shift is not equal to 0 As you can see the p Values are different (one with H0 rejection and the other one not). I tested whether it could be that the STATA one isn't paired but this doesn't seem to be the problem. I'm dumbfound what could lead to such a difference. I couldn't find any seetings I have missed but I somehow I guess I'm using the function in the wrong way... Any ideas? Thanks a lot in advance! [[alternative HTML version deleted]] ______________________________________________ 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.
