I've got two set of data :
22.45 21.56 20.48 19.59 21.52 = A
and
22.15 21.98 20.42 20.58 19.61 = B
I perform a wilcox.test on this two set
wilcox.test(A, B) and I'd this answer:
Wilcoxon rank sum test
data: A and B
W = 12, p-value = 1
alternative hypothesis: true mu is not equal to 0
Should I interpret that there is no difference between the two sets ?
--
Cordialement
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~ Emmanuel POIZOT
~ CNAM/INTECHMER
~ B.P. 324
~ 50103 CHERBOURG CEDEX
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Emmanuel POIZOT <poizot at intechmer.cnam.fr> writes:> I've got two set of data : > 22.45 21.56 20.48 19.59 21.52 = A > and > 22.15 21.98 20.42 20.58 19.61 = B > I perform a wilcox.test on this two set > wilcox.test(A, B) and I'd this answer: > > Wilcoxon rank sum test > > data: A and B > W = 12, p-value = 1 > alternative hypothesis: true mu is not equal to 0 > > Should I interpret that there is no difference between the two sets ?In a word, yes. No *detectable* difference that is. What the p-value is saying is that there is no way of getting a W closer to the value expected under the hypothesis of no difference (which is 12.5 in this case). -- O__ ---- Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- 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 at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
Emmanuel POIZOT wrote:> > I've got two set of data : > 22.45 21.56 20.48 19.59 21.52 = A > and > 22.15 21.98 20.42 20.58 19.61 = B > I perform a wilcox.test on this two set > wilcox.test(A, B) and I'd this answer: > > Wilcoxon rank sum test > > data: A and B > W = 12, p-value = 1 > alternative hypothesis: true mu is not equal to 0 > > Should I interpret that there is no difference between the two sets ?Not really. At least there is no significant difference - that's what you have tested. Uwe -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- 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 at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._