Frequencies for first 10,000 rows of varpsu variable in h84 dataset :

   VARIANCE |
 ESTIMATION |
        PSU |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      4,351       43.51       43.51
          2 |      4,607       46.07       89.58
          3 |      1,042       10.42      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Feb 2018