Standardized precipitation index 12
Standardized precipitation index calculated at 12-month time scale
spi12(data, data_names = NULL, na.rm = FALSE, ...)
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 |
index value
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.
data(data_all) spi12(data = data_all$rr)
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