Meta-analysis on aspirin in preventing death after myocardial infarction.

Data example in Fleiss (1993) for meta-analysis with binary outcomes.

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A data frame with the following columns:

- study
Study label

- year
Year of publication

- event.e
Number of deaths in aspirin group

- n.e
Number of observations in aspirin group

- event.c
Number of deaths in placebo group

- n.c
Number of observations in placebo group

Fleiss JL (1993),
The statistical basis of meta-analysis.
*Statistical Methods in Medical Research*, **2**, 121–145.

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