Frequencies for a_c2_9920 variable in prds_hosp10_yr2017 dataset :

        OPT |
    A000000 |
      09920 |
      00200 |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      3,749      100.00      100.00
------------+-----------------------------------
      Total |      3,749      100.00

by Jean Roth , jroth@nber.org , 26 Oct 2018