twoway (function y = (x^(1 -1)*exp(-1*x/2))/((2^(1.0))*exp(lngamma(1.0))), range(0 20)) ///
(function y = (x^(1.5-1)*exp(-1*x/2))/((2^(1.5))*exp(lngamma(1.5))), range(0 20)) ///
(function y = (x^(2.5-1)*exp(-1*x/2))/((2^(2.5))*exp(lngamma(2.5))), range(0 20)) ///
(function y = (x^(5-1)*exp(-1*x/2))/((2^(5))*exp(lngamma(5))), range(0 20)) ///
(scatteri .5 0.1 "{it:df} = 2", msymbol(i) mlabpos(3)) ///
(scatteri .24 1.7 "{it:df} = 3", msymbol(i) mlabpos(3)) ///
(scatteri .15 5.0 "{it:df} = 5", msymbol(i) mlabpos(3)) ///
(scatteri .10 10.0 "{it:df} = 10", msymbol(i) mlabpos(3)) ///
, xtitle(Chi-squared) ytitle("") ylabel(, format(%6.1f)) legend(off) name(figu, replace) //ysize(6) xsize(6)
// Also search chidemo
