Stata 11 help for mod() help mod() ------------------------------------------------------------------------------- Title [D] functions -- Functions Mathematical function mod(x,y) Domain x: -8e+307 to 8e+307 Domain y: 0 to 8e+307 Range: 0 to 8e+307 Description: returns the modulus of x with respect to y. mod(x,y) = x - y*int(x/y) mod(x,0) = . Also see Manual: [D] functions Help: [D] functions, [D] functions (math functions)