Frequencies for first 10,000 rows of yrcoll variable in morg11 dataset :

Demographic |
 s-years of |
    college |
     credit |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        306        3.06        3.06
          2 |        660        6.60        9.66
          3 |      1,250       12.50       22.16
          4 |        294        2.94       25.10
          5 |        158        1.58       26.68
          . |      7,332       73.32      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Mar 2017