Synchronization, a basic nonlinear phenomenon, is widely observed in diverse complex systems studied in physical, biological and other natural sciences, as well as in social sciences, economy and finance. While studying such complex systems, it is important not only to detect synchronized...

The question addressed is whether or not childhood epidemics such as measles and chickenpox are characterized by low-dimensional chaos. We propose a new method for the detection and extraction of hidden periodic components embedded in an irregular cyclical series, and study the characterization...

Three profound changes - the mortality, fertility and contraception transitions - characterized the Victorian era in England. Economists, following Becker (1960), focus on the first two and underplay the third by assuming couples can achieve their fertility target at no cost. The historical...