randIndex {partitionComparison}

Rand Index

Description

Compute the Rand index

\frac{N_{11} + N_{00}}{N}

Usage

randIndex(p, q)

## S4 method for signature 'Partition,Partition'
randIndex(p, q)

## S4 method for signature 'PairCoefficients,missing'
randIndex(p, q = NULL)

Arguments

p

The partition P or an instance of PairCoefficients

q

The partition Q or NULL

Methods (by class)

• randIndex(p = Partition, q = Partition): Compute given two partitions

• randIndex(p = PairCoefficients, q = missing): Compute given the pair coefficients

Author(s)

Fabian Ball [e-mail]

References

Rand WM (1971). “Objective Criteria for the Evaluation of Clustering Algorithms.” Journal of the American Statistical Association, 66(336), 846–850.

Examples

isTRUE(all.equal(randIndex(new("Partition", c(0, 0, 0, 1, 1)),
                           new("Partition", c(0, 0, 1, 1, 1))), 0.6))