Statistical measures for finite or infinite data streams. All operations use numerically stable floating point arithmetic. Measurements can be performed over the entire input stream or on a sliding window of fixed or variable size. Where possible, measures are computed online without buffering the input stream. Includes: Summary: length, sum, powerSum Location: minimum, maximum, rawMoments, means, exponential smoothing Spread: range, variance, deviations Shape: skewness, kurtosis Sample statistics, resampling Probablity distribution: frequency, mode, histograms Transforms: Fast fourier transform