Liver pathology data
Altman, D.G., Bland, J.M. (1994) ``Diagnostic tests 1: sensitivity and specificity,'' British Medical Journal, vol 308, 1552.
a data frame
These data have the results of a x-ray examination
to determine whether liver is abnormal or not (in the scan
column) versus the more extensive pathology results that
approximate the truth (in pathology
).
#> 'data.frame': 344 obs. of 2 variables: #> $ pathology: Factor w/ 2 levels "abnorm","norm": 1 1 1 1 1 1 1 1 1 1 ... #> $ scan : Factor w/ 2 levels "abnorm","norm": 1 1 1 1 1 1 1 1 1 1 ...