[R] Fligner-Killeen test on binary data

[emeline mourocq]

Thanks for all those information. I then have to find another way to test
difference in variance between my two groups.

-----Original Message-----
From: peter dalgaard [mailto:pdalgd at gmail.com] 
Sent: Monday, 4 April, 2016 7:11 PM
To: emeline mourocq <emeline.mourocq at uzh.ch>
Cc: r-help at r-project.org
Subject: Re: [R] Fligner-Killeen test on binary data

That's not an R question but a stats question, but I wouldn't do it. For one
thing: The variance of binary data is a function of the mean, so the
research question is dubious in the first place. Secondly, the test is based
on ranking and comparing absolute differences from the group median, which
for binary data is generally 0 or 1, so all absolute differences will be
1.... Put differently, the results are more than likely to be complet
rubbish.

-pd 

> On 04 Apr 2016, at 11:48 , emeline mourocq <emeline.mourocq at uzh.ch> wrote:
> 
> Hello,
> 
> 
> 
> I investigate survival until the following year (0,1) and I wish to 
> test if the variance in survival for two or more groups are 
> significantly different from each other.
> 
> 
> 
> I read that the Fligner-Killeen test is a non-parametric test which is 
> very robust against departures from normality but is it correct 
> (valuable technique for publication) to use it on binary data?
> 
> 
> 
> In other words, can I use
> fligner.test(survival~categorical_predictor,data=mydata) when survival 
> is binary (0,1)?
> 
> 
> 
> Best regards
> 
> Emeline
> 
> 
> 
> 
> 
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--
Peter Dalgaard, Professor,
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