Minimum distance estimation (MDE) is a statistical method for fitting a mathematical model to data, usually the empirical distribution.
Let be the empirical distribution function based on the sample.
Let be an estimator for . Then is an estimator for .
If there exists a such that , then is called the minimum distance estimate of .
Goodness of fit statistics use in minimum distance estimationEdit
Most theoretical studies of minimum distance estimation, and most applications, make use of "distance" measures which underlie already-established goodness of fit tests: the test statistic used in one of these tests is used as the distance measure to be minimised. Below are some examples of statistical tests that have been used for minimum distance estimation.
The chi-square test uses as its criterion the sum, over predefined groups, of the squared difference between the increases of the empirical distribution and the estimated distribution, weighted by the increase in the estimate for that group.
The Cramér–von-Mises criterion uses the integral of the squared difference between the empirical and the estimated distribution functions.
The Anderson–Darling test is similar to the Cramér–von-Mises criterion except that the integral is of a weighted version of the squared difference, where the weighting relates the variance of the empirical distribution function.
The theory of minimum distance estimation is related to that for the asymptotic distribution of the corresponding statistical goodness of fit tests. Often the cases of the Cramér–von-Mises criterion, the Kolmogorov–Smirnov test and the Anderson–Darling test are treated simultaneously by treating them as special cases of a more general formulation of a distance measure. Examples of the theoretical results that are available are: consistency of the parameter estimates; the asymptotic covariance matrices of the parameter estimates.
- Boos, D.D. (1982). "Minimum Anderson–Darling Estimation". Communications in Statistics, Part A – Theory and Methods, 11 (24), 2747–2774.
- Blyth, Colin R. (June 1970). On the Inference and Decision Models of Statistics. The Annals of Mathematical Statistics 41 (3): 1034–1058.
- Drossos, Constantine A., Andreas N. Philippou (December 1980). A Note on Minimum Distance Estimates. Annals of the Institute of Statistical Mathematics 32 (1): 121–123.
- Parr W.C., Schucany W.R. (1980). "Minimum distance and robust estimation". Journal of the American Statistical Association, 75, 616–624.
- Wolfowitz, J. (March 1957). The Minimum Distance Method. The Annals of Mathematical Statistics 28 (1): 75–88.