Title: Ellipses

Source: Noma and Johnson (1977)

Description: A subject was asked to assess the similarity of 16
ellipses having different shapes and sizes. The ellipses were
constructed according varying eccentricity ("shape") and area
("size"). For example, ellipse 4 is very flat and long, but 13 is more
circular and also larger. The rated each pair of ellipses on a scale
from 1 (most similar) to 10 (least similar or most different). This
rating was replicated three times, with the pairs presented in
different random orders. The data contains the summed ratings for each
pair of ellipses.

Design of the 16 elipses:

Ellipse  Shape  Size

   1       1      1
   2       2      1
   3       3      1
   4       4      1
   5	   1	  2
   6	   2	  2
   7	   3	  2
   8	   4	  2
   9	   1	  3
  10	   2	  3
  11	   3	  3
  12	   4	  3
  13	   1	  4
  14	   2	  4
  15	   3	  4
  16	   4	  4