Small Sample Properties of the Mantel-Haenszel Test Statistic for Density Follow-Up Studies
✍ Scribed by Dr. H. C. Boshuizen
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 360 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0323-3847
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✦ Synopsis
For the analysis of combinations of 2 x 2 non-contingency tablea 88 obtuined from density followup studiea (relating a number of evente to a number of person-years of follow-up) an analogue of theMante1-Haenszel test for 2 ~2 contingency tables is widely u d . In this paper the small sample properties of this test, both with and without continuity correction, are evaluated. A h the improvement of the test-stetistic by using the first four cumulante via the Edgeworth expansion was studied. Reeulta on continuity correction agree with similar studies on the Mantel-Haenszel Statistic for 2 X2 contingency tables: Continuity correction gives a p-value which approximatee the exact p-value better than the p-value obtained without this correction; both the exact test and ita approximations show considerable conservatism in small samples; the uncorrected Mantel-Haenszel test statistic gives a p-value that agrees more with the nominal significance level, but can be anti-conservative. The p-value baaed on the first four cumulante gives a better approximation of the exact p-value than the continuity corrected test, especially when the distribution hsa marked skewness.