Frequencies for first 10,000 rows of int_pnspnap variable in mcbsatc2013 datase

      Proxy |
 needed due |
to physical |
  condition |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        300        3.00        3.00
          2 |        799        7.99       10.99
          . |      8,901       89.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 24 May 2016