Measure

prior_entropy

Entropy, in bits, of the prior class distribution. Calculated by taking the sum of -log2(priorProb) over all instances, where priorProb is the prior probability of the actual class for that instance. If instances are weighted, the weighted sum is taken.

Source Code:
See WEKA's Evaluation class

Properties

Minimum value0
Maximum valueInf
Unitbits
OptimizationHigher is better