spi.per.year {precintcon}

Standardized Precipitation Index

Description

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

Usage

spi.per.year(object, period = 3, distribution = "Gamma", FUN = mean)

Arguments

object

a daily or monthly precipitation serie.

period

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

distribution

(it has no effect yet).

FUN

the function used to summarize the standardized precipitation index per year. (Default function: mean).

Value

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

• year is the year.

• spi is the standardized precipitation index.

Author(s)

Lucas Venezian Povoa [e-mail]

See Also

spi read.data

Examples

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

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