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This data frame gives the results of 10 separate case–control studies on the association of breast cancer and whether a woman had breast–fed children.

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A data frame with 20 observations on the following 4 variables.

- Study
Factor indicating the study from which data was taken

- Lactate
Whether women had breast–fed children (lactated)

- Cancer
Number of women with breast cancer

- NoCancer
Number of women without breast cancer

Meta–analysis refers to the analysis of analyses. When the main
results of studies can be cast into 2*x*2 tables of counts,
it is natural to combine individual odds ratios with a logistic
regression model that includes a factor to account for different odds
from the different studies. In addition, the odds ratio itself might
differ slightly among studies because of different effects on
different populations or different research techniques. One approach
for dealing with this is to suppose an underlying common odds ratio
and to model between–study variability as extra–binomial variation.

Ramsey, F.L. and Schafer, D.W. (2013). *The Statistical Sleuth: A
Course in Methods of Data Analysis (3rd ed)*, Cengage Learning.

Data gathered from various sources by Karolyn Kolassa as part of a Master's project, Oregon State University.

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