The group 4 IHA parameters measure the frequency and duration of high and low pulses.
vector of length 2; the cut off for a low pulse and a high pulse, respectively
A zoo object containing the flow series
the type of year factor to be used,
By default, the pulse thresholds are the 25th and 75th
percentiles of the distribution of flows. TNC's IHA
software uses the quantile as defined
which corresponds to R's
type = 6 option in
quantile. The default thresholds here are
calculated using R's default
type = 7 option.
a matrix of group 3 parameters
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