Often the time derivative of a measured variable is of as much interest as the variable itself. For a growing population of biological cells, for example, the population’s growth rate is typically ...

This update to a frequently requested article first published here in 1998 explains how statistical methods can create many different position accuracy measures. As the driving forces of positioning ...

Think about a baseball game. The batter has to decide whether and how to hit the incoming pitch. He needs to judge the position and speed of the ball, given his own visual uncertainty, and to estimate ...