Morris and Christiansen (1995) presented a dataset involving 23 hospitals (out of a total of 219 hospitals) that had at least 50 kidney transplants during a 27-month period.
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A data frame with 23 rows and 4 variables:
Number of kidney transplants in each hospital during a 27 months period (at least 50)
Graft failure rates for kidney transplant operations i.e. number of graft failures/sample size
Severity index at each hospital which is measured by the average fraction of females, blacks, children, and extremely ill kidney recipients at that hospital
The standard error for the graft failure rate. The variance for the graft failure rate D_{i}, is approximated by (0.2)(0.8)/n_{i}, where 0.2 is the observed failure rate for all hospitals. Thus, D_{i} is assumed known.
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