Double sum analysis

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The double sum analysis (double sum curve method) is a statistical technique in the hydrology or meteorology to In homogeneities to identify a series of measurements and to clean, if necessary. For this purpose, the values of a series of measurements known to be homogeneous and related to the data to be tested (for example precipitation / runoff or rainfall values of neighboring measuring points) and the series to be tested are added up and graphically plotted against each other.

${\ displaystyle sum (1) = measured value (1)}$

${\ displaystyle sum (2) = measured value (1) + measured value (2)}$

${\ displaystyle sum (n) = measured value (1) + measured value (2) + ... + measured value (n)}$

The linear relationship between the two series of measurements is now assessed. In the event of any deviations (e.g. apparent systematic error from a certain date), either a shortened measurement period can now be used for further analysis or the systematic error can be removed using linear regression, for example .