Description Usage Arguments Details Examples
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.
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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).
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