Computes expected proportional shortfall for a given ditribution
epsg(spec, alpha, ...)a character string specifying the distribution (for example, "norm" corresponds to the standard normal)
the probabilities associated with expected proportional shortfalls
other parameters
An object of the same length as alpha, giving expected proportional shortfalls computed.
S. Chan and S. Nadarajah, Risk: An R package for risk measures, submitted
F. Belzunce, J. F. Pinar, J. M. Ruiz and M. A. Sordo, Comparison of risks based on the expected proportional shortfall, Insurance: Mathematics and Economics, 51, 2012, 292-302 <DOI:10.1016/j.insmatheco.2012.05.003>