Cumulative distribution function of the Generalized Logistic probability distribution function, and maximum likelihood fitting function.
pglo(x, para)parglo.maxlik(x, ini)
A vector of cumulative probabilities corresponding to the quantiles in x
.
vector of quantiles for which to evaluate the PDF.
a list of parameters of a generalized Logistic distribution function, as yield by function parglo
.
a vector of initial values of the parameters to be fit.
Santiago Beguería
This functions are used internally by spei
and spi
and are supposed to never be needed by the regular user. Initial values for maximum likelihood estimation can be provided by parglo
.
S.M. Vicente-Serrano, S. Beguería, J.I. López-Moreno. 2010. A Multi-scalar drought index sensitive to global warming: The Standardized Precipitation Evapotranspiration Index – SPEI. Journal of Climate 23: 1696, DOI: 10.1175/2009JCLI2909.1.