precipitation_concentration.RdFunction precipitation_concentration() calculates daily precipitation
concentration (Martin-Vide et al. 2004).
precipitation_concentration(p)A numeric vector with daily precipitation values.
Function precipitation_concentration() returns a value
between 0 (equal distribution of rainfall) and 1 (one day concentrates all
rainfall).
Martin-Vide J (2004) Spatial distribution of a daily precipitation concentration index in peninsular Spain. International Journal of Climatology 24, 959–971. doi:10.1002/joc.1030.