Parameter estimation becomes difficult in high-dimensional spaces due to the increasing sparseness of the data. Therefore, when a low-dimensional representation is embedded in the data, dimensionality reduction methods become useful. One such method-projection pursuit regression (Friedman and Stuetzle 1981 (PPR)-is capable of performing dimensionality reduction by composition, namely, it constr...

ver four decades ago, Milton Friedman published Capitalism and Freedom (Friedman 1962). This insightful little book traveled across a broad range of important topics collected around the theme of how government can best operate within a free society. The message was expanded two decades later in Free to Choose (Friedman and Friedman 1980). At the time, the battle of the ideas introduced by thes...

IT HAS BEEN demonstrated in different laboratories that chronic treatment with desoxycorticosterone acetate (DCA) induces in rats a particular type of hypertensive disease.' Observations by Friedman and Friedman, Friedman, Friedman and Nakashima, Prado and Herbert-Carrington, Magaldi and Prado showed that following abrupt interruption of the desoxycorticosterone treatment, from 30 to 40 per cen...

A redshift-magnitude relation for the two exact non-uniform pressure spherically symmetric Stephani universes is presented. The Kristian-Sachs method expanding the relativistic quantities in series is used, but only first order terms in redshift z are considered. The numerical results are given both for centrally placed and non-centrally placed observers. In the former case the redshiftmagnitud...