In addition to Cedric's comments, these are large sample procedures. Your
sample sizes are two small. I don't think any procedures using normal
approximations are inappropriate for your case. I would suggest making a
reasonable distribution on the populations to avoid asymptotic results.
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Sorry that I did not answer you earlier, I would like to thank you again
for your advice and the time you dedicated to my problem.
In my case it was not possible to increase the sample size but I would
take your advice into account for the next sampling and also for
presenting these results!
Th
Glad that I could help :)
Another thing that came to my mind ist that when you simply look at the values
of the different groups, they differ quite strongly in my opinion. They are
between two and three times higher in the second group than the ones from the
first group. Therefore it would be a
Hi Cedric,
Thanks a lot for your help, after calculating U value using the formula
from wikipedia I also found that the W given by R was in fact the U value
that I could directly compared to table of critical value.
Your advice were really good and useful. I would also be careful with the
conclusi
Issues like that in this thread can often be resolved by reading the
help page for the relevant function.
From:
?wilcox.test
Note
The literature is not unanimous about the definitions of the Wilcoxon
rank sum and Mann-Whitney tests. The two most common definitions
correspond to the sum
Hi Chloe,
first of all, I want to note, that you should be careful using the WMW-test.
Even though it is often reported to be some sort of a "swiss-army-knife" for
comparing two distributions, recent research on this test has revelaed that it
is crucial what hypotheses you consider. Also the as
Dear all,
I want to compare the efficiency of 2 methods in extracting proteins from
algal samples. I collected 6 independant algal samples and I extracted 3 by
the method 1 and 3 others by the method 2.
So I have 2 groups of 3 samples, that are not paired. I would like to know
if the results obta
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