Frequencies for first 10,000 rows of latmin variable in nsrd dataset :

   Latitude |
     Minute |
    Portion |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        260        2.60        2.60
          4 |        260        2.60        5.20
          5 |        260        2.60        7.80
          6 |        260        2.60       10.40
          7 |        260        2.60       13.00
          8 |        260        2.60       15.60
          9 |        260        2.60       18.20
         10 |        260        2.60       20.80
         11 |        260        2.60       23.40
         12 |        260        2.60       26.00
         13 |        260        2.60       28.60
         15 |        260        2.60       31.20
         16 |        260        2.60       33.80
         19 |        520        5.20       39.00
         21 |        260        2.60       41.60
         22 |        260        2.60       44.20
         31 |        520        5.20       49.40
         33 |        260        2.60       52.00
         34 |        260        2.60       54.60
         35 |        520        5.20       59.80
         36 |        260        2.60       62.40
         39 |        260        2.60       65.00
         46 |        260        2.60       67.60
         47 |        780        7.80       75.40
         49 |        260        2.60       78.00
         53 |      1,300       13.00       91.00
         55 |        260        2.60       93.60
         57 |        260        2.60       96.20
         58 |        120        1.20       97.40
         59 |        260        2.60      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Jun 2016