Plotting Position

Given a set of ordered quantities, a list of the fractions of values at or below each quantity is know as a plotting position. A quantile-quantile plot compares observed quantiles with quantiles for a sample of the same size from a similar distribution, determined by evaluating the quantile function for the similar distribution at the plotting positions.

REFERENCES:

Cunnane, C. "Unbiased Plotting Positions--A Review." J. Hydrology 37, 205-222, 1978.

Evans, M.; Hastings, N.; and Peacock, B. Statistical Distributions, 3rd ed. New York: Wiley, 2000.

Harter, H. L. "Another Look at Plotting Positions." Comm. Stat., Th. and Methods 13, 1613-1633, 1984.