sysuse sp500, clear 
#delimit ;

histogram volume, freq
  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