7. The computer readable program storage device of claim 5 , the method further comprising representing squares of time series signal values in each chunk as a weighted superposition of atoms that are members of a squared shape dictionary, to create a compressed squared time series, wherein a variance of said original time series is calculated from said compressed time series and said compressed squared time series.
5. The computer readable program storage device of claim 1 , the method further comprising storing in compressed form additional time-series derived from said original time-series to speed up a specific query.