Test Data for Individual Project 5:
  In this data:
     1919 - equally close to 1901 and 1902 (correlation about .7)
          - equally close to 1903 and 1904 (correlation about -.7)
     1920 - closest to 1901 (about .9)
          - next closest to 1902 (about .45)
          - third closest to 1904 (about -.45)
  -------------------------------------------------------
Year  Jan  Feb

1901  1  0
1902  0  1
1903 -1  0
1904  0 -1
1919  1  1
1920  2  1