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- W2077292419 abstract "In a recent Statistics Note1 we referred to a weighted two sample t test. Here we describe how it is done. The data were the percentage of requests from general practitioners for x ray examinations which were judged appropriate (table 1), where general practitioners had been randomised to intervention or control groups.2View this table:Table 1 Number of requests conforming to guidelines for each practice in the intervention and control groupsIf we compare the two sets of percentages by the usual two sample t method, each observation (practice) has an equal impact on the result. As some practices contributed fewer requests than others, we wish these practices to have a lesser effect on the estimate of the difference. We can do this by weighting the practices by the …" @default.
- W2077292419 created "2016-06-24" @default.
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- W2077292419 date "1998-01-10" @default.
- W2077292419 modified "2023-10-18" @default.
- W2077292419 title "Weighted comparison of means" @default.
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- W2077292419 doi "https://doi.org/10.1136/bmj.316.7125.129" @default.
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