pastas.stats.signatures.low_pulse_count#
- low_pulse_count(series, quantile=0.2, rolling_window='7D')[source]#
Average number of times the series exceeds a certain threshold per year.
- Parameters
series (pandas.Series) – Pandas Series with DatetimeIndex and head values.
quantile (float, optional) – Quantile used as a threshold.
rolling_window (str, optional) – Rolling window to use for smoothing the time series. Default is 7 days. Set to None to disable. See the pandas documentation for more information.
- Returns
Average number of times the series exceeds a certain threshold per year.
- Return type
Notes
Number of times during which the head drops below a certain threshold. The threshold is defined as the 20th percentile of non-exceedance Richter et al. [1996].
Warning
This method is sensitive to measurement noise, e.g., every change is sign in the differences is counted as a pulse. Therefore, it is recommended to smooth the time series first (which is also the default).