question: public WeightDistribution ( ColumnExampleTable columnTable , int [ ] selection , int attributeNumber ) { calculateLabelWeights ( columnTable , selection , attributeNumber ) ; leftLabelWeights = new double [ totalLabelWeights . length ] ; leftWeight = 0 ; totalWeight = getTotalWeight ( totalLabelWeights ) ; if ( hasMissings ) { missingsWeight = getTotalWeight ( missingsLabelWeights ) ; rightWeight = totalWeight - missingsWeight ; rightLabelWeights = arrayDifference ( totalLabelWeights , missingsLabelWeights ) ; } else { missingsWeight = 0 ; rightWeight = totalWeight ; rightLabelWeights = new double [ totalLabelWeights . length ] ; System . arraycopy ( totalLabelWeights , 0 , rightLabelWeights , 0 , totalLabelWeights . length ) ; } }
target:  Initializes the counting arrays with the start distribution.