computenspi: computenspi

In mammask/droughtr: Reduced Bias Drought Forecasting Framework

computenspi

Description

Computes the stationary and non-stationary version of the Standardized Precipitation Index. The non-stationary version uses GAMLSS and models the parameters of a Gamma distribution by incorporating the trend of accumulated precipitation.

Usage

computenspi(x, stationaryspi, spiScale, dist = "gamma")

Arguments

x	data.table
stationaryspi	logical used in array method (TRUE when stationary and FALSE when otherwise)
spiScale	A positive integer value, typically ranging from 1 to 24
dist	A character that can be either, "normal" when Normal distribution is used, "gamma" for Gamma, "zigamma" for zero adjusted Gamma and "weibull" for Weibull.

Value

data.table

Examples

computenspi(x = dummyrainfall(1950, 2000),
            stationaryspi = TRUE,
            spiScale = 12,
            dist = 'gamma'
            )

mammask/droughtr documentation built on Feb. 25, 2024, 2:27 p.m.