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

       DEATH |
 CERTIFICATE |      Freq.     Percent        Cum.
-------------+-----------------------------------
************ |      4,039       40.39       40.39
000000000000 |      5,961       59.61      100.00
-------------+-----------------------------------
       Total |     10,000      100.00

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