On Mon, 13 Aug 2012, Allin Cottrell wrote: > On Mon, 13 Aug 2012, Logan Kelly wrote: > >> Is there a cumulative product command similar to the >> cumulative sum command cum? > > Not built-in, but it's trivial to write. > > <hansl> > function series cumprod (series y) > y = y * y(-1) > return y > end function > </hansl>
Beware the power of logarithms! <hansl> nulldata 10 fact = exp(cum(ln(index))) print index fact -o </hansl> -------------------------------------------------- Riccardo (Jack) Lucchetti Dipartimento di Economia Università Politecnica delle Marche (formerly known as Università di Ancona) r.lucchetti(a)univpm.it http://www2.econ.univpm.it/servizi/hpp/lucchetti --------------------------------------------------
