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berlin
2002 Dec 20
0
testing correlated proportions
...4% at 6 month.
The question is, given the information below, how do I test if
the intervention group has a better improvement?
Intuitively, I imagine that a difference of 44% should be better
than a 14% difference in a sample of about 30 respondents. But
it is no so according to Levin & Serlin's method (J. of Stats
Education, 8 (2), 2000).
Levin and Serlin say that correlated proportions between two
groups can be tested by a simple 2x2 table using the frequency of
changes:
Control Intervention
------------------------------------
0 --> 1 (worse) 2 0
1 --> 0 (better...