  R package krippendorffsalpha provides tools for measuring agreement using
Krippendorff's Alpha coefficient, a well-known nonparametric measure of
agreement (also called inter-rater reliability and various other names). This
article first develops Krippendorff's Alpha in a natural way, and situates
Alpha among statistical procedures. Then the usage of package
krippendorffsalpha is illustrated via analyses of two datasets, the latter of
which was collected during an imaging study of hip cartilage. The package
permits users to apply the Alpha methodology using built-in distance functions
for the nominal, ordinal, interval, or ratio levels of measurement.
User-defined distance functions are also supported. The fitting function can
accommodate any number of units, any number of coders, and missingness.
Bootstrap inference is supported, and the bootstrap computation can be carried
out in parallel.
