[R] Fligner-Killeen test on binary data

[Bert Gunter]

Peter: Bravo!


On Mon, Apr 4, 2016 at 10:10 AM, peter dalgaard <pdalgd at gmail.com> wrote:
> 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 complete rubbish."

Again, probably not appropriate, but anyway:
Fortune Nomination!

Cheers,
Bert


>
> -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,
> Center for Statistics, Copenhagen Business School
> Solbjerg Plads 3, 2000 Frederiksberg, Denmark
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