spi6 {ClimInd}

Standardized precipitation index 6

Description

Standardized precipitation index calculated at 6-month time scale

Usage

spi6(data, data_names = NULL, na.rm = FALSE, ...)

Arguments

data

daily precipitation, mm

data_names

names of each period of time

na.rm

logical. Should missing values (including NaN) be removed?

...

further arguments passed to or from other methods

Value

index value

References

McKee, T. B., Doesken, N. J. and Kleist, J.: The relationship of drought frequency and duration to time scales, Eighth Conf. Appl. Climatol., 179–184, 1993.

Examples

data(data_all)
spi6(data = data_all$rr)