Function for generating the n-period absolute change
chgr(x, n = 1)
The time series for the change to be calculated.
The period for the growth to be calculated over.
In order to ensure the change calculated is reliable, the following rule are applied.
50% of the data must be present.
The length of the time series must be greater than n
Otherwise the growth will not be computed.
The n-period change of the time series.
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