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Directional sum
The types of directional sum implemented in Easy HVSR are:
NS direction
Is not performed any directional sum but is taken exclusively the trace in the NorthSouth direction of the recording.
EW direction
Is not performed any directional sum is taken only directional but is taken exclusively the trace in the EastWest direction of the recording.
Arithmetic mean
The two horizontal traces are summed together with a simple arithmetic mean.
Geometric mean
The two horizontal traces are summed together with a simple Euclidean mean.
Mean square
The two horizontal traces are summed together with the arithmetic mean of the squares.

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