*! version 1.1.0 , 22oct 98, Guy van Melle
*!
*! gen a matrix with obs counts (cols) on several (rows) discrete vars
*! with same possible answers. Matrix will contain missing values if
*! some counts are zero because matcell only reports discovered values
*! (not unobserved ! sic)
*!
*! idea: fill data with an obs for each of the desired values
*! then correct counts (-1) then drop added obs
*!
*! call: fulltab varlist [if] [in], vals(# [# [# ...]]]) mat(string) missing
*!
*! e.g. filltab rep78 rep79 if foreign==0, v(1 2 3 4 5) mat(A) miss
*!      (assuming repair gradings for 1979 in auto.dta)
*!
*---------------
prog def fulltab
*---------------
	loc varlist "req ex"
	loc if "opt"
	loc in "opt"
	loc options "MISSing Vals(string) Mat(string)"
	parse "`*'"
	if "`vals'"=="" {
		di in red "must specify values to be counted"
		exit
	}
	if "`mat'"=="" {
		di in red "must specify matrix to hold counts"
		exit
	}
	parse "`vals'", parse (" ")
	loc nval: word count `vals'
	loc c 0
	while `c'<`nval' {
		loc c=`c'+1
		loc val`c': word `c' of `vals'
		confirm integer number `val`c''
	}
	parse "`varlist'", parse(" ")
	loc nvar: word count `varlist'

	tempvar touse tmp
	preserve
	mark `touse' `if' `in'
	if "`missing'"!="" {markout `touse' `varlist'}
	loc oldN=_N
	loc newN=_N + `nval'
	qui {
		set obs `newN'
		g `tmp'=(_n -`oldN')*(_n>`oldN')
		replace `touse'=1 if `tmp'
	}
	tempname M
	loc v 0
	qui while `v'<`nvar' {
		loc v=`v'+1
		loc avar : word `v' of `varlist'
		loc c 0
		while `c'<`nval' {
			loc c=`c'+1
			replace `avar'=`val`c'' if `tmp'==`c'
		}
		tab `avar' if `touse', matcell(`M')
		mat `M'=`M''
		if `v'==1 {mat `mat'=`M'}
		else      {mat `mat'=`mat' \ `M'}
	}
	mat `M' = J(`nvar',`nval',1)
	mat `mat' = `mat' - `M'
	mat rownames `mat' = `varlist'
	mat li `mat'
end