Frequencies for clmn_num variable in snf_nmrc2540_96_2012_long dataset :

   clmn_num |      Freq.     Percent        Cum.
------------+-----------------------------------
       0000 |         27        3.74        3.74
       0100 |        114       15.81       19.56
       0200 |         87       12.07       31.62
       0300 |         63        8.74       40.36
       0301 |         16        2.22       42.58
       0400 |         96       13.31       55.89
       0500 |         62        8.60       64.49
       0600 |          8        1.11       65.60
       0650 |         13        1.80       67.41
       0700 |          3        0.42       67.82
       0750 |         25        3.47       71.29
       0800 |         13        1.80       73.09
       0900 |          2        0.28       73.37
       0950 |         11        1.53       74.90
       1050 |          1        0.14       75.03
       1100 |          3        0.42       75.45
       1150 |         13        1.80       77.25
       1200 |          3        0.42       77.67
       1250 |         13        1.80       79.47
       1330 |         13        1.80       81.28
       1350 |         13        1.80       83.08
       1400 |          2        0.28       83.36
       1600 |         34        4.72       88.07
       1800 |         33        4.58       92.65
       2000 |          2        0.28       92.93
       2100 |          2        0.28       93.20
       2200 |          3        0.42       93.62
       2A00 |         20        2.77       96.39
       3A00 |         26        3.61      100.00
------------+-----------------------------------
      Total |        721      100.00

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