Frequencies for first 10,000 rows of cert_no variable in person dataset :

       DEATH |
 CERTIFICATE |      Freq.     Percent        Cum.
-------------+-----------------------------------
************ |      4,037       40.37       40.37
000000000000 |      5,963       59.63      100.00
-------------+-----------------------------------
       Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016