Frequencies for d_4_snf_c11_90 variable in prds_hosp10_yr2012 dataset :

d_4_snf_c11 |
        _90 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          1        0.02        0.02
          9 |          1        0.02        0.03
         21 |          1        0.02        0.05
         23 |          1        0.02        0.06
          . |      6,223       99.94      100.00
------------+-----------------------------------
      Total |      6,227      100.00

by Jean Roth , jroth@nber.org , 24 Aug 2018