Support function for computing statistics for left-censored data using the "fill-in" probability plotting procedure method (Helsel and Cohn, 1988), now known as regression on order statistics. This method is also known as the "robust" approach (Helsel, 2012).
mdlROS(x, method = "ROS", alpha = 0.4)the data to estimate, Missing values permitted and ignored. Must be an object of class "lcens," a numeric vector, or the output from censpp.
the method to use, either "ROS" or "log ROS."
the offset for plotting postion.
A list containing the mean and standard deviation, filled in
values for the censored values, and the censored levels. If method
is "log ROS," then the list also contains the mean and standard deviation of the
natural log-transformed values computed by regression on order statistics.
Added from smwrQW.
Helsel, D.R. and Cohn, T.A., 1988, Estimation of descriptive statistics for multiply censored water quality data: Water Resources Research v. 24, n. 12, pp.1997--2004
Helsel, D.R. 2012, Statistics for censored environmental data using Minitab and R: New York, Wiley, 324 p.