Many economic variables have a persistence property which may be called extended memory and the relationship between variables may well be nonlinear. This pair of properties allow for many more types ...

Linear regression is a powerful and long-established statistical tool that is commonly used across applied sciences, economics and many other fields. Linear regression considers the relationship ...

Moreover, the authors noted a non-linear dose-response association between physical activity represented as metabolic equivalent of task (MET)-minute per week and severe COVID-19 and mortality.

Cause and effect in the financial markets are not always easy to understand, especially when the relationship can’t be plotted as a straight line on a graph, and changes are difficult to predict.