Robust estimation Kernel weights Statistical tests Fisher-consistency Missing at random Parameter estimation Asymptotic distributions Errors Fisher consistency Generalized linear models Kernel weight M-location functionals Missing data Outliers Regression analysis Testing Adsorption isotherms Asymptotic analysis Asymptotic behaviors Asymptotic properties Bootstrap Computer intensive methods Covariance matrix Data analysis Distribution functions Elliptical distributions Elliptical symmetry Empirical studies Estimation F tests