calc_spi: spi calculations

In Climandes/ClimIndVis: Calculation, verification and visualisation of climate indices

spi calculations

Description

spi calculations

Usage

calc_spi(
  temp = NULL,
  date_factor,
  param = FALSE,
  timescale,
  ref,
  distribution,
  NAmaxAgg = 20,
  iformat,
  limit = 4
)

Arguments

temp	vector of daily precipitation data to calculate SPI
date_factor	factors of dates
timescale	Integer. Timescale for monthly SPI calculation. The timescale is the window length (in month) of a backward looking running mean. Default = 6.
ref	Vector with start and end year for reference period. If no reference period is specified, the full period is used as reference period.
distribution	A character string naming a distribution of package stats (see for example GammaDist). For more information on the choice of the distribution, see section Details. Default = "gamma".
NAmaxAgg	number of days to check for <<mcdd>>
limit	Truncate SPI values that are larger than a given threshold, as values larger than 4 are not reasonable. Default = 4. The truncation can be disabled by setting limit = Inf.
forecast	logical; Returns SPI parameters of historical timeseries to transform forecast data. Default = FALSE

Climandes/ClimIndVis documentation built on June 9, 2025, 7:09 p.m.