Frequencies for wksht_cd variable in snf_nmrc2540_96_2012_long dataset :

   wksht_cd |      Freq.     Percent        Cum.
------------+-----------------------------------
    A000000 |         53        7.35        7.35
    A700000 |         11        1.53        8.88
    A800000 |          3        0.42        9.29
    B000001 |        243       33.70       43.00
    B000002 |        156       21.64       64.63
    B100000 |         14        1.94       66.57
    C000000 |         24        3.33       69.90
    D00A181 |         17        2.36       72.26
    D00A182 |          1        0.14       72.40
    E00A183 |          4        0.55       72.95
    E10A180 |          3        0.42       73.37
    G000000 |         33        4.58       77.95
    G200001 |          6        0.83       78.78
    G200002 |          2        0.28       79.06
    G300000 |          6        0.83       79.89
    S200000 |          3        0.42       80.31
    S300001 |         36        4.99       85.30
    S300002 |         42        5.83       91.12
    S300003 |         48        6.66       97.78
    S700004 |         16        2.22      100.00
------------+-----------------------------------
      Total |        721      100.00

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