A model tree (MT) is similar to a decision tree, but includes the multivariate linear

regression functions at the leaves and is able to predict continuous numeric value attributes (Shrestha, Solomatine 2006; Witten, Frank 2000; Kaluzny et al.

Finally, it is worth noting that our results here, that is, that the

regression function exhibits-different constant terms across regions while the variance of the model varies both across regions and over time, demonstrates that the multiplicative heteroscedasticity approach allows a level of generality not available in the typical fixed/random-effects approach to analyzing panel data.

10 level in all

regression function specifications in which it was included.

For reference, its first column repeats the estimates of the slopes of SUM's

regression function.

All three influence measures (DFFITS, Cook's distance, and DFBETAS) have been ascertained to have no influential cases on the fitting of the

regression function.

The model for

regression function are three types: linear function, exponential function, and trigonometric function.

The summary of linear

regression functions and of correlation coefficients is in Table.

1997; Puertas & Perez, 2003), the general form of

regression functions in turning process, when studying the influence of three independent variables on the dependent variable, may be a function of the following form:

In this particular case the obtained

regression function have a 5 degree polynomial form which on the considered interval of time is characterized by an ascending trend (Cohal, 1998).

The objective of this paper consist in the establishing of two

regression functions for the analytical evaluation with experimental data of two specific parameters for the cutting process: edge wear and the technological speed, applied for wide use.

Specifically, consider a rating plan with premiums P and an insurance score S that is determined by a

regression function using a set of insured characteristics that produces a Gini index.

Pons explores tests of hypotheses in regular nonparametric models, including tests based on empirical processes and smooth estimators of density functions,

regression functions, and regular functions defining the distribution of point processes and Gaussian diffusion processes.