Ricerc@Sapienza

The conference extends the problem to the issue of waste in general; toward the conclusion also in light of the specific role played by the two Universities promoting the conference and considering the specific interests of the writer, it becomes necessary to focus on the construction segment.
The issue pertains to the absence of an industrial approach to production in general and, on the other, a lack of culture that invests in the adoption of equal terms for the client, the productive enterprises, the sector operators, citizens and young people (university students above all).

The generalized smooth transition autoregression (GSTAR) parametrizes the joint asymmetry in the duration and length of cycles in macroeconomic time series by using particular generalizations of the logistic function. The symmetric smooth transition and linear autoregressions are nested in the GSTAR. A test for the null hypothesis of dynamic symmetry is presented. Two case studies indicate that dynamic asymmetry is a key feature of the U.S. economy.