npregderiv package      The package "Nonparametric Estimation of the
                        Derivatives of a Regression Function"
                        implements the method of Wang and Lin (2015) of
                        estimating the first and second derivatives of
                        a regression function from the original data in
                        the case of an increasing evenly spaced design.
                        The derivative estimates are computed at the
                        design points. The computations are based on
                        the difference quotients. The package also
                        includes the experimental data set on the
                        deflection measurements of a round substrate
                        before and after the thin film deposition. See
                        more details regarding the experiment and data
                        analysis in the article of Savchuk and Volinsky
                        (2020).
reg_1derivWL            Estimating the first derivative of a regression
                        function by the method of Wang and Lin (2015)
reg_2derivWL            Estimating the second derivative of a
                        regression function by the method of Wang and
                        Lin (2015)
wafer40                 The data set on the n=7755 substrate's
                        deflection measurements before and after the
                        thin film deposition in two radial directions.
