# Article

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Keywords:
\$M\$-estimation of non-linear regression models; the influence points
Summary:
An asymptotic formula for the difference of the \$M\$-estimates of the regression coefficients of the non-linear model for all \$n\$ observations and for \$n-1\$ observations is presented under conditions covering the twice absolutely continuous \$\varrho\$-functions. Then the implications for the \$M\$-estimation of the regression model are discussed.
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