Frequencies for tax_period variable in eobmfpr dataset :

 Tax Period |      Freq.     Percent        Cum.
------------+-----------------------------------
     200812 |          1        0.06        0.06
     201108 |          1        0.06        0.13
     201112 |          1        0.06        0.19
     201206 |          1        0.06        0.26
     201412 |          3        0.19        0.45
     201509 |          2        0.13        0.58
     201511 |          1        0.06        0.64
     201512 |         22        1.41        2.05
     201604 |          3        0.19        2.24
     201605 |          1        0.06        2.30
     201606 |         18        1.15        3.45
     201607 |          1        0.06        3.52
     201609 |          4        0.26        3.77
     201610 |          1        0.06        3.84
     201612 |         53        3.39        7.23
     201701 |          1        0.06        7.29
     201703 |          1        0.06        7.36
     201704 |          2        0.13        7.49
     201705 |          3        0.19        7.68
     201706 |        123        7.87       15.55
     201707 |          5        0.32       15.87
     201708 |          4        0.26       16.12
     201709 |         41        2.62       18.75
     201710 |          1        0.06       18.81
     201711 |          1        0.06       18.87
     201712 |        481       30.77       49.65
     201801 |          7        0.45       50.10
     201802 |          8        0.51       50.61
     201803 |         11        0.70       51.31
     201804 |          4        0.26       51.57
     201805 |          8        0.51       52.08
     201806 |        127        8.13       60.20
     201807 |          3        0.19       60.40
     201808 |          3        0.19       60.59
     201809 |         14        0.90       61.48
     201811 |          1        0.06       61.55
     201812 |         51        3.26       64.81
     201901 |          1        0.06       64.88
          . |        549       35.12      100.00
------------+-----------------------------------
      Total |      1,563      100.00

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