Measure to compare two or more sets w.r.t. their similarity.
This Measure can be instantiated via the dictionary mlr_measures or with the associated sugar function msr():
mlr_measures$get("sim.phi")
msr("sim.phi")
Type: "similarity"
Range: \([-1, 1]\)
Minimize: FALSE
The Phi Coefficient is defined as the Pearson correlation between the binary representation of two sets \(A\) and \(B\). The binary representation for \(A\) is a logical vector of length \(p\) with the i-th element being 1 if the corresponding element is in \(A\), and 0 otherwise.
If more than two sets are provided, the mean of all pairwise scores is calculated.
This measure is undefined if one set contains none or all possible elements.
Dictionary of Measures: mlr_measures
as.data.table(mlr_measures) for a complete table of all (also dynamically created) Measure implementations.
Other similarity measures:
mlr_measures_sim.jaccard