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 ...

Charles O. Crawford, Functions of Independent Variables in Research and Program Planning, Public Health Reports (1896-1970), Vol. 84, No. 9 (Sep., 1969), pp. 831-834 ...

A new procedure for mixed integer programming is presented. It is applicable where the integer variables must be either zero or one, and where the integer variables are divided into sets such that the ...

Among the improvements, Luciana de Melo e Abud, program manager, highlighted the new variable explorer functionality in an announcement post. "The Python Interactive experience now comes with a ...