In this short paper, we demonstrate that the popular penalized estimation method typically used for variable selection in parametric or semiparametric models can actually provide a way to identify linear components in additive models. Unlike most studies in the literature, we are NOT performing...

The so-called purchasing-power parity (PPP) puzzle takes one of two forms. In its first form, early tests of the PPP-hypothesis failed to reject unit roots in real exchange rates, thus rejecting the hypothesis of PPP holding in the long term. In the more recent literature, the literature on the...

In Perez-Amaral, Gallo, and White (2003), the authors proposed an automatic predictive modelling tool called Relevant Transformation of the Inputs Network Approach (RETINA). It is designed to embody flexibility (using nonlinear transformations of the predictors of interest), selective search...

To establish a QSAR of anticancer activity for Isatin derivatives, a series of Isatin derivatives were analyzed by principal component analysis, multiple linear regression, partial least squares and multiple nonlinear regression analysis. The authors proposed linear and nonlinear models and...

On interpreting the regression discontinuity design as a local experiment -- Identification and estimation using a density discontinuity approach -- The deterremce effect of prison: dynamic theory and evidence -- An overview of geographically disontinuous treatment assignments with an...