Description Usage Arguments Details Value Author(s) References Examples

The group 4 IHA parameters measure the frequency and duration of high and low pulses.

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`thresholds` |
vector of length 2; the cut off for a low pulse and a high pulse, respectively |

`x` |
A zoo object containing the flow series |

`year` |
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
http://www.roguewave.com/portals/0/products/imsl-numerical-libraries/c-library/docs/8.0/html/cstat/stat.htm
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

http://www.conservationgateway.org/Files/Pages/indicators-hydrologic-altaspx47.aspx

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