[R] Glitch in Kruskal-Wallis test?

Jenny Liu jenny@liu00 @ending from gm@il@com
Sat Dec 22 14:09:38 CET 2018

Hi Michael,

Thank you for your reply! I'm testing the difference in proportions. Temp
is temperature, and Prop is the proportion of insect pupae that survived at
that temperature. I was told by a statistician that the K-W was appropriate
for testing proportions, but perhaps you know of an alternative? I have
already tested for heteroscedasticity using the Breusch-Pagan test.

Thanks again,

On Dec 22, 2018 7:38 AM, "Michael Dewey" <lists using dewey.myzen.co.uk> wrote:

Dear Jenny

What exactly do you think you are testing here? You are telling K-W you
have seven groups each with a single value which is not the usual
situation for K-W.


On 22/12/2018 04:58, Jenny Liu wrote:
> Hi everyone,
> I have been running a K-W test with the attached data, PupMort1. My code:
> kruskal.test(Prop~Temp,data=PupMort1)
> However, I found that I get the exact same result when I change the
x-values, as
> in the attached data PupMort2.
> Test run with PupMort1Kruskal-Wallis rank sum testdata:  Prop by Temp

> Kruskal-Wallis chi-squared = 6, df = 6, p-value = 0.4232
> Test run with PupMort2Kruskal-Wallis rank sum testdata:  Prop by Temp

> Kruskal-Wallis chi-squared = 6, df = 6, p-value = 0.4232
> Does anybody know why this is happening?
> Thank you!
> Jenny
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