sysuse sp500, clear 
#delimit ;

histogram volume, freq normal
xaxis(1 2)
ylabel(0(10)60, grid) 
xlabel(12321 "mean" 
      9735 "-1 s.d." 
     14907 "+1 s.d." 
      7149 "-2 s.d."
     17493 "+2 s.d." 
     20078 "+3 s.d."
     22664 "+4 s.d."
, axis(2) grid gmax)
xtitle("", axis(2))
subtitle("S&P 500, January 2001 - December 2001")
note("Source:  Yahoo!Finance and Commodity Systems, Inc.")
;
#delimit cr