Frequencies for first 10,000 rows of crtfct_type_cd variable in posclia2018 dataset :

       CLIA |
Certificate |
  Type Code |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        709        7.09        7.09
          2 |      7,179       71.79       78.88
          3 |        486        4.86       83.74
          4 |      1,394       13.94       97.68
          9 |        232        2.32      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Feb 2019