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About Asmaa Abd Elhameed Ahmed
Expertise
Medical Statistics,how to choose your statistical test, statistical tests using SPSS program ,Research design ,sample size calculation

Experience
Demonstrator in Biomedical informatics &Medical Statistics department ,Alexandria university

Organizations
Medical Research Institute,Alexandria university Egypt

Education/Credentials
B.Sc. of Medicine, Faculty of Medicine,Alexandria university candidate for Master degree in Medical Statistics

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Probability & Statistics - stat test

Expert: Asmaa Abd Elhameed Ahmed - 10/4/2009

Question
Hi, when using the mann-whitney ranking test, can I use it on both untransformed and log transformed data? There wouldnt be any difference right because rankings dont change?

thanks

Answer
hi,
Mann-Whitney test used to compare quantitative not normally distributed data between 2 groups
or when sample size is small.
It can be used for both untransformed and untransformed data,but you already transform the data to apply parametric tests(at-test) ,so, if still not normally distributed after transformation it is better to apply Mann-Whitney on the untransformed

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