f_missing.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

{* 30nov2004}{...}
{phang}
{cmd:missing(}{it:x1}{cmd:,}{it:x2}{cmd:,}{it:...}{cmd:,}{it:xn}{cmd:)}
	returns 1 if any of the arguments evaluates to {it:missing}
	and 0 otherwise.  Stata has two concepts of missing values:
	numeric missing value ({hi:., .a, .b, ... , .z}) and
	string missing value ({hi:""}).  If {it:x} is numeric
	then {cmd:missing(}{it:x}{cmd:)} is equivalent to
	{it:x} {ul:>} {hi:.}.  If {it:x} is string then
	{cmd:missing(}{it:x}{cmd:)} is equivalent to {it:x}=="".
	The arguments to {cmd:missing()} may be a mix of string
	and numeric types.{p_end}