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

   Latitude |      Freq.     Percent        Cum.
------------+-----------------------------------
     -17.75 |        260        2.60        2.60
  -16.83333 |        260        2.60        5.20
      -16.8 |        520        5.20       10.40
      -16.6 |        260        2.60       13.00
      -16.5 |        260        2.60       15.60
     -16.45 |        260        2.60       18.20
      -16.3 |        260        2.60       20.80
  -16.26667 |        260        2.60       23.40
     -16.15 |        260        2.60       26.00
     -16.05 |        260        2.60       28.60
     -15.85 |        260        2.60       31.20
  -15.61667 |        260        2.60       33.80
      -15.6 |        260        2.60       36.40
  -15.53333 |        260        2.60       39.00
  -15.51667 |        260        2.60       41.60
  -15.28333 |        260        2.60       44.20
  -15.23333 |        260        2.60       46.80
      -15.1 |        520        5.20       52.00
  -15.08333 |        260        2.60       54.60
        -15 |        260        2.60       57.20
  -14.93333 |        120        1.20       58.40
     -14.85 |        520        5.20       63.60
  -14.83333 |        260        2.60       66.20
      -14.8 |        260        2.60       68.80
  -14.71667 |        260        2.60       71.40
  -14.68333 |        260        2.60       74.00
  -14.48333 |        260        2.60       76.60
     -14.45 |        520        5.20       81.80
  -14.26667 |        520        5.20       87.00
      -14.1 |        520        5.20       92.20
  -14.08333 |        260        2.60       94.80
  -14.01667 |        260        2.60       97.40
     -13.45 |        260        2.60      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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