Generic methods for spei objects: Generic methods for SPIGA objects.
Description
Generic methods for extracting information and plotting SPIGA objects.Usage
calcSPI(Pt,alpha, beta,m, nd)
Arguments
Pt
monthly precipitation series.
alpha
parameter to Gamma function.
beta
parameter to Gamma function.
m
Number of zeros in the column.
References
McKee, Thomas B. and Doesken, Nolan J. and Kleist, John. 1993. The relationship of Drought Frequency and Duration to Time Scales. Eighth Conference on Applied ClimatologyA. Belauneh and J. Adamowski. Standard Precipitation Index Drought Forecasting Using Neural Networks, Wavelet Neural Networks, and Support Vector Regression. Applied Computational Intelligence and Soft Computing, http://dx.doi.org/10.1155/2012/794061