adjustedRandIndex {partitionComparison}

Adjusted Rand Index

Description

Compute the Adjusted Rand Index (ARI)

\frac{2(N_{00}N_{11} - N_{10}N_{01})}{N'_{01}N_{12} + N'_{10}N_{21}}

Usage

adjustedRandIndex(p, q)

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

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

Arguments

p

The partition P or an instance of PairCoefficients

q

The partition Q or NULL

Methods (by class)

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

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

Author(s)

Fabian Ball [e-mail]

References

Hubert L, Arabie P (1985). “Comparing Partitions.” Journal of Classification, 2(1), 193–218.

Examples

isTRUE(all.equal(adjustedRandIndex(new("Partition", c(0, 0, 0, 1, 1)), 
                                   new("Partition", c(0, 0, 1, 1, 1))), 1/6))