This function computes cummulative sums of timeseries replicates.
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x 

y 
constant, or vector if the processed timeseries replicates have several levels, to scale the computed cumulative values. If NA then the computed cumulative sums are not scaled. 
z 

Cummulative sums of timeseries replicates (e.g. treeradial increments) are scaled on reference constants (e.g. individual tree diameters).
data frame with the original vector, and its scaledcummulative sums.
Wilson Lara <wilarhen@gmail.com>, Felipe Bravo <fbravo@pvs.uva.es>
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