Re: [R] Non-normal data issues in PhD software engineering experiment

From: Gustaf Rydevik <>
Date: Thu, 10 Jul 2008 18:33:06 +0200

On Thu, Jul 10, 2008 at 5:15 PM, Andrew Jackson <> wrote:
> Hi All,

Hi Andrew,

The main questions here are not R-related, but statistical modelling questions, and much too broad for the R list. They are things you'd ask a (paid) statistical consultant. I would suggest taking contact with your own university's statistical support unit: ,and discuss the best approach for analysis.

Rummaging around in R, looking for tests that you can squeeze your data into *really* isn't the best approach (and ?friedman.test clearly states that it's for unreplicated designs only).

Some things I'd want to know if I were your statistical consultant:

-What are you doing with your research? what's your goal?

-What exactly are sensitivity
(,"coverage","execution","infection","propogation") measuring? looking at your data, it seems as if sensitivity is making discrete jumps. Why is this?

-What's your actual hypothesis? That the means sensitivity values for the two paradigms differ by a constant no matter the version? or that they differ by a fraction?

Answers to the above questions might be good to bring to your meeting with the statistics faculty.

Good luck with your research,


Gustaf Rydevik, M.Sci.
tel: +46(0)703 051 451
address:Essingetorget 40,112 66 Stockholm, SE

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Received on Thu 10 Jul 2008 - 16:39:11 GMT

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