range
Estimates the range based on uniform distribution theory. Uses the minimum unbiased estimators based on the order statistics. See: 1. Castillo E, Hadi AS. A method for estimating parameters and quantiles of distributions of continuous random variables. Computational Statistics & Data Analysis. 1995 Oct;20(4):421–39.
This approach guarantees that the estimated lower limit will be less than the observed minimum and that the estimate upper limit will be greater than the observed maximum.