Frequencies for wksht_cd variable in snf_alpha2540_96_2012_long dataset :

   wksht_cd |      Freq.     Percent        Cum.
------------+-----------------------------------
    A000000 |         63       55.26       55.26
    A81000A |          1        0.88       56.14
    B100000 |         14       12.28       68.42
    G300000 |          1        0.88       69.30
    S000000 |          1        0.88       70.18
    S200000 |         34       29.82      100.00
------------+-----------------------------------
      Total |        114      100.00

by Jean Roth , jroth@nber.org , 17 Feb 2018