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This data set appears as an example for an application of mixture modelling in disease mapping. The data is on hepatitis B cases in Berlin 1989.
data(hepab)
A data frame with 23 observations on the following 2 variables.
observations
a numeric vector
expected
Schlattmann, P. and B\"ohning, D. (1993). “Mixture models and disease mapping”. Statistics in Medicine. 12, 1943--1950.