spi {precintcon}

Standardized Precipitation Index

Description

Calculates the Standardized Precipitation Index (SPI) on a daily or monthly precipitation serie.

Usage

spi(object, period = 3, distribution = "Gamma")

Arguments

object

a daily or monthly precipitation serie.

period

the number of months to be aggregated in the calculation of the standardized precipitation index. (Default value: 3)

distribution

it has no effect yet. (Default value: "Gamma")

Value

A data.frame (precintcon.spi) containing the following variables:

• year is the year.

• month is the month.

• spi is the standardized precipitation index.

Author(s)

Lucas Venezian Povoa [e-mail]

See Also

precintcon.plot.spi read.data

Examples

##
# Loading the monthly precipitation serie.
data(monthly)

##
# Performing the Standardized Precipitation Index
spi(monthly, period = 3)