Defining Sample Quantiles by the True Rank Probability

Table 1

Parameters obtained for Gumbel distribution from MC simulation with 50,000 cycles. These parameters cannot be used in evaluating plotting positions (see text).

Exact parameter		Estimated parameter
		Weibull	Gringorten
Mean	5	5.381	5.196
Standard deviation	2	2.787	1.893
	4.099918	4.127	4.345
	1.559394	2.173	1.476