st: Fw: PROPORTIONAL T TEST WITH OVERLAPPING

["keesman" <keesman@tpg.com.au>]

Hi,

I want to do a proportional t test with overlapping data  (see below). 
Official Stata doesn't have this option for their proportion test. The 
statistical package Quantum has a proportional t test with an overlapping 
option. The overlapping option adjusts the results to allow for overlapping.

For example:

Each person is asked if they use BrandA  and then a second question do they 
use BrandB

1 yes  and 0 no

Id BrandA     BrandB
1       1             0
2       1             1
3       1             0
4       0             0
5       1             1
6        0            1
7        0            1
8        1            1
9        1            0
10      1            1

I wish to determine if the proportion of BrandA is significantly different 
from BrandB  (taking into account overlapping).

I'm eager to know if there is any  Stata program that does this or if there 
is a reference to  this procedure.



With best wishes, Karl Keesman

Survey Design & Analysis P/L
ABN 37 051 831 826
Karl Keesman,
Managing Director,
PO Box 1206,
Blackburn North VIC 3130
Phone:   03 9878 7373.
Fax:   03 9878 2345.
Web site: http://survey-design.com.au


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