HyMED Hydrologic Model Evaluation for Drought

This package facilitates the analysis and evaluation of hydrologic model streamflow output during periods of drought. This package calculates the Cohen's Kappa, Spearman correlation coefficient, ratio of standard deviation, percent bias, normalized mean absolute error (NMAE) in the annual time series of drought duration, NMAE in the annual times series of the distance the minimum percentile is below the drought threshold (drought intensity), and the NMAE in the annual time series of the drought deficit volume (sum of drought deficits for all droughts during the year; drought severity) between observed and modeled streamflow time series. Variable and fixed threshold options are provided, with default percentiles of 5th, 10th, 20th, and 30th.