Frequencies for first 10,000 rows of varpsu variable in h126f dataset :

   VARIANCE |
 ESTIMATION |
  PSU, 2009 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      4,733       47.33       47.33
          2 |      4,219       42.19       89.52
          3 |      1,048       10.48      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Feb 2018