SPIF: SPI and Drought Events Characteristics
In Fiorella-vj/SPID: What the Package Does (spi and drought events analysis )

Description Usage Arguments Details Examples

View source: R/SPIF.R

This function allows to compute the Standarized Precipitation Index (SPI) based on an established. climatological period Esta es una funcion de ejemplo para multiplicar un valor o vector x por cuatro.

1 2	SPIF(data, scale, ini.clim = NULL, fin.clim = NULL, threshold = NULL, distr = "gamma")

`data`	a zoo object with time ordered values of monthly precipitation.
`scale`	an integer value representing the time scale at which the SPI will be computed.
`ini.clim`	optional, character date of starting point of the reference period used for computing the index (p.e. c("1981-01-01")).Defaults to NULL
`fin.clim`	optional, character date of ending point of the reference period used for computing the index (p.e. c("2010-12-01")). Defaults to NULL
`threshold`	optional, a negative integer value defining the threashold to use for drought events based on SPI series. Defaults to -1.
`distr`	distribution function to standarize data, could be: "gamma","gev" or "genlog". Default "gamma"

The fitSCI function allow computing the SPI index. Basically, the fitSCI function standardize the precipitation following a Gamma distribution function (i.e., they transform it to a standard Gaussian variate with zero mean and standard deviation of one).