Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
RE: st: Which test to use?
From
"Seed, Paul" <[email protected]>
To
"[email protected]" <[email protected]>
Subject
RE: st: Which test to use?
Date
Fri, 20 May 2011 10:13:38 +0100
Toby's data can be summarised as 3 frequencies using
-tabulate-. (X==1 & Y==0; X==0 & Y==1 ; X==0 & Y==0)
He can get CI for the percentages of these with a little ingenuity
He tells us that X and Y never occur together;
so his question (as asked) does not make much sense.
They are linked by definition, (as a chi-sq test will confirm),
and no test is needed.
Allowing for his English, a sensible question is
"Is X more common than Y?"
He can approach this by ignoring occasions when X and Y are the
same, using -bitest-. If he has another question in mind,
perhaps he can explain further.
******* example code *********
tab X Y, cell
gen neither = X+Y == 0
ci X Y neither, bin
bitest X = 0.5 if X !=Y
******* end example code *****
On Thu, May 19, 2011 at 9:12 AM, Toby <[email protected]> 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?
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/