question: public double [ ] [ ] predictIntervals ( Instance instance , double confidenceLevel ) throws Exception { UnivariateIntervalEstimator e = ( UnivariateIntervalEstimator ) getDensityEstimator ( instance , false ) ; return e . predictIntervals ( confidenceLevel ) ; }
target:  Returns an N * 2 array, where N is the number of prediction intervals. In each row, the first element contains the lower boundary of the corresponding prediction interval and the second element the upper boundary.