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

       DEATH |
 CERTIFICATE |      Freq.     Percent        Cum.
-------------+-----------------------------------
************ |      4,005       40.05       40.05
000000000000 |      5,995       59.95      100.00
-------------+-----------------------------------
       Total |     10,000      100.00

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