Double-Mass Analysis on the Computer

by Rameshwar Singh,

Serial Information: Journal of the Hydraulics Division, 1968, Vol. 94, Issue 1, Pg. 139-142

Document Type: Journal Paper


Hydrologists use double-mass analysis to verify the consistency of a precipitation or streamflow record. Precipitation of a station is plotted against the combined precipitation of the surrounding stations. The consistency of the record is verified if a single straight line fitted through the points is reasonable. The analysis is done on the computer by fitting a straight line and a fourth-degree polynomial through the points and comparing the two sums of squares of deviations of the points from the fitted curves. If a record is found to be inconsistent, it is adjusted by bringing the deviated points along a desired single straight line. The method should be of value to the hydrologists having access to computers.

Subject Headings: Precipitation | High-rise buildings | Hydrology | Verification | Computer analysis | Streamflow | Polynomials | Curvature

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