Quantile of Pearson Type III distribution for log-transformed data
calc_qlpearsonIII(p, meanlog = 0, sdlog = 1, skew = 0)
p: Vector of non-exceedance probabilities, between 0 and 1, to calculate quantiles.meanlog: Vector of mean of the distribution of the log-transformed data.sdlog: Vector of standard deviation of the distribution of the log-transformed data.skew: Vector of skewness of the distribution of the log-transformed data.Quantiles for the described distribution
calc_qpearsonIII and calc_qlpearsonIII are functions to fit a log-Pearson type III distribution from a given mean, standard deviation, and skew. This source code is replicated, unchanged, from the swmrBase package in order to reduce the dependency on that package.
calc_qlpearsonIII(0.1)
Asquith, W.H., Kiang, J.E., and Cohn, T.A., 2017, Application of at-site peak-streamflow frequency analyses for very low annual exceedance probabilities: U.S. Geological Survey Scientific Investigation Report 2017–5038, 93 p. [Also available at https://doi.org/10.3133/sir20175038.]
Lorenz, D.L., 2015, smwrBase—An R package for managing hydrologic data, version 1.1.1: U.S. Geological Survey Open-File Report 2015–1202, 7 p.
[Also available at https://doi.org/10.3133/ofr20151202.]
calc_qpearsonIII