ABSTRACT
These are equations and statistical considerations pertaining to estimates reported in the Results section.This Appendix should be read in parallel with that section.
There are I = 39 magnet hospitals, each matched to J = 5 control hospitals. Let yij be the mortality rate in the j
th match to the ith magnet hospital, i = 1, . . . , 39, j = 1, . . . , 5. Denote by yi0 the mortality rate in the i
th magnet hospital.Then there are I x J = 195 pairs of mortality differences, ∆yij = yi0-yij.
