# NOT RUN {
# It is recommended to set up a pbgumbel
# graph to see the starting and ending
# range of the desired quantile.
curve(pbgumbel(x, mu = -2, sigma = 1, delta = -1), xlim = c(-5, 5))
(value <- qbgumbel(.25, mu = -2, sigma = 1, delta = -1, initial = -4, final = -2))
pbgumbel(value, mu = -2, sigma = 1, delta = -1)
# }
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