Frequencies for first 10,000 rows of intermediary variable in psfipf dataset :

Intermediar |
   y Number |      Freq.     Percent        Cum.
------------+-----------------------------------
       1001 |        338        3.38        3.38
       1011 |      1,682       16.82       20.20
       1911 |        673        6.73       26.93
       2001 |        106        1.06       27.99
       3001 |        599        5.99       33.98
       4011 |        400        4.00       37.98
       4911 |        306        3.06       41.04
       5901 |        985        9.85       50.89
       7001 |        928        9.28       60.17
       9101 |      1,239       12.39       72.56
      10111 |        986        9.86       82.42
      10211 |        208        2.08       84.50
      10311 |          3        0.03       84.53
      12001 |        202        2.02       86.55
      12101 |        103        1.03       87.58
      12901 |        423        4.23       91.81
      13001 |        801        8.01       99.82
      15101 |         18        0.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 24 Sep 2018