Frequencies for first 10,000 rows of crosswalklevel variable in planxw2018 dataset :

  Crosswalk |
      Level |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,567       75.67       75.67
          1 |      1,008       10.08       85.75
          2 |      1,358       13.58       99.33
          4 |         67        0.67      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 8 Dec 2017