f_sum.ihlp

是一个经济学管理应用软件 很难找的 但是经济学学生又必须用到

{* *! version 1.0.0  20may2005}{...}
{phang}
{cmd:sum(}{it:x}{cmd:)} returns the running sum of {it:x}
	treating {it:missing} ({hi:.}) values as zero.  See
	{helpb egen} for an alternative sum function, {cmd:total()},
	that produces a constant equal to the overall sum.{p_end}