Some classes of variables can be lagged; that is, their value at each observation is remembered, and previous values can be referred to by the lagging functions. Other classes have only a single value ...

Without variables, programming languages are next to useless. Fortunately, JavaScript’s variable system is incredibly powerful and versatile.

Programming statements are used to create or modify the values of the explanatory variables in the MODEL statement. They are especially useful in fitting models with time-dependent explanatory ...