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Re: st: Which test to use?


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Which test to use?
Date   Thu, 19 May 2011 09:28:26 +0100

I don't follow this. To start with,

1. If there is some rule mapping -decision- to -X- and -Y-, then there
is no information in -X- -Y- that is not in -decision-. If you have a
quantitative variable and a categorical reduction of it, it is usually
better practice to use all the information available.

2. I don't see how you can compare the frequencies of -X- and -Y-
without in effect reporting (consequences of) your rule in #1.

Nick

On Thu, May 19, 2011 at 9:12 AM, Toby <spiegeldesaster@googlemail.com> wrote:
> Hello,
>
> I have data of the following character
>
>
> decision      X      Y
> 34               1      0
> 34               1      0
> 56               0      0
> 77               0      1
> 23               0      0
>
>
> X and Y take the function of categorizing the variable decision. If I
> take the mean value of X I get the frequency of decision that could be
> classifed as X, the same holds for Y. It could never be that X and Y
> take the value 1 at the same time.
> Now I want to test whether the frequency of X is significantly
> different from the frequency of Y. Can anybody help me figuring out
> which statistical test I have to use?

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