Quick help needed: Chi-square

[Charlotte-9]

Dear all,

Apologies for starting a new thread, but I can't seem to respond to the
thread I started yesterday (keep getting an error message).

My original question asked about comparing uptake of breast and bowel
screening in a common group of women.  If I want to make the following
basic comparison, which test does this require seeing as I am working with
the same sample of women?

79.30% undertook breast screening
64.64% undertook bowel screening
….from a sample of 72566 women.

I basically want to see if there is a significant difference between the
two proportions.  Could anyone give me some syntax for this?

Sorry for the basic nature of the question (it's one of those things I
know I should know!!) and thanks!

Lou

[Swank, Paul R]

Look for McNemar's test.


Paul R. Swank, Ph.D. Professor
Director of Reseach
Children's Learning Institute
University of Texas Health Science Center-Houston


-----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of Lou
Sent: Thursday, February 22, 2007 5:32 AM
To: [hidden email]
Subject: Quick help needed: Chi-square

Dear all,

Apologies for starting a new thread, but I can't seem to respond to the thread I started yesterday (keep getting an error message).

My original question asked about comparing uptake of breast and bowel screening in a common group of women.  If I want to make the following basic comparison, which test does this require seeing as I am working with the same sample of women?

79.30% undertook breast screening
64.64% undertook bowel screening
….from a sample of 72566 women.

I basically want to see if there is a significant difference between the two proportions.  Could anyone give me some syntax for this?

Sorry for the basic nature of the question (it's one of those things I know I should know!!) and thanks!

Lou

[Marta García-Granero]

Hi Lou

Thursday, February 22, 2007, 12:32:13 PM, You wrote:

L> My original question asked about comparing uptake of breast and bowel
L> screening in a common group of women.  If I want to make the following
L> basic comparison, which test does this require seeing as I am working with
L> the same sample of women?

L> 79.30% undertook breast screening
L> 64.64% undertook bowel screening
L> ….from a sample of 72566 women.

L> I basically want to see if there is a significant difference between the
L> two proportions.  Could anyone give me some syntax for this?

McNemar test.



--
Regards,
Dr. Marta García-Granero,PhD           mailto:[hidden email]
Statistician

---
"It is unwise to use a statistical procedure whose use one does
not understand. SPSS syntax guide cannot supply this knowledge, and it
is certainly no substitute for the basic understanding of statistics
and statistical thinking that is essential for the wise choice of
methods and the correct interpretation of their results".

(Adapted from WinPepi manual - I'm sure Joe Abrahmson will not mind)