* Horseshoe Crab Data;

data crab;

/* satell='satellite' */

/* if satell>0 then y=1; if satell=0 then y=0; n=1 */

/* if color=4 then dark=0; if color<4 then dark=1 */



color    spine    width    satell    weight    y    n    dark

-------------------------------------------------------------

  2        3       28.3       8       3.05     1    1      1

  3        3       22.5       0       1.55     0    1      1

  1        1       26.0       9       2.30     1    1      1

  3        3       24.8       0       2.10     0    1      1

  3        3       26.0       4       2.60     1    1      1

  2        3       23.8       0       2.10     0    1      1

  1        1       26.5       0       2.35     0    1      1

  3        2       24.7       0       1.90     0    1      1

  2        1       23.7       0       1.95     0    1      1

  3        3       25.6       0       2.15     0    1      1

  3        3       24.3       0       2.15     0    1      1

  2        3       25.8       0       2.65     0    1      1

  2        3       28.2      11       3.05     1    1      1

  4        2       21.0       0       1.85     0    1      0

  2        1       26.0      14       2.30     1    1      1

  1        1       27.1       8       2.95     1    1      1

  2        3       25.2       1       2.00     1    1      1

  2        3       29.0       1       3.00     1    1      1

  4        3       24.7       0       2.20     0    1      0

  2        3       27.4       5       2.70     1    1      1

  2        2       23.2       4       1.95     1    1      1

  1        2       25.0       3       2.30     1    1      1

  2        1       22.5       1       1.60     1    1      1

  3        3       26.7       2       2.60     1    1      1

  4        3       25.8       3       2.00     1    1      0

  4        3       26.2       0       1.30     0    1      0

  2        3       28.7       3       3.15     1    1      1

  2        1       26.8       5       2.70     1    1      1

  4        3       27.5       0       2.60     0    1      0

  2        3       24.9       0       2.10     0    1      1

  1        1       29.3       4       3.20     1    1      1

  1        3       25.8       0       2.60     0    1      1

  2        2       25.7       0       2.00     0    1      1

  2        1       25.7       8       2.00     1    1      1

  2        1       26.7       5       2.70     1    1      1

  4        3       23.7       0       1.85     0    1      0

  2        3       26.8       0       2.65     0    1      1

  2        3       27.5       6       3.15     1    1      1

  4        3       23.4       0       1.90     0    1      0

  2        3       27.9       6       2.80     1    1      1

  3        3       27.5       3       3.10     1    1      1

  1        1       26.1       5       2.80     1    1      1

  1        1       27.7       6       2.50     1    1      1

  2        1       30.0       5       3.30     1    1      1

  3        1       28.5       9       3.25     1    1      1

  3        3       28.9       4       2.80     1    1      1

  2        3       28.2       6       2.60     1    1      1

  2        3       25.0       4       2.10     1    1      1

  2        3       28.5       3       3.00     1    1      1

  2        1       30.3       3       3.60     1    1      1

  4        3       24.7       5       2.10     1    1      0

  2        3       27.7       5       2.90     1    1      1

  1        1       27.4       6       2.700    1    1      1

  2        3       22.9       4       1.600    1    1      1

  2        1       25.7       5       2.000    1    1      1

  2        3       28.3      15       3.000    1    1      1

  2        3       27.2       3       2.700    1    1      1

  3        3       26.2       3       2.300    1    1      1

  2        1       27.8       0       2.750    0    1      1

  4        3       25.5       0       2.250    0    1      0

  3        3       27.1       0       2.550    0    1      1

  3        3       24.5       5       2.050    1    1      1

  3        1       27.0       3       2.450    1    1      1

  2        3       26.0       5       2.150    1    1      1

  2        3       28.0       1       2.800    1    1      1

  2        3       30.0       8       3.050    1    1      1

  2        3       29.0      10       3.200    1    1      1

  2        3       26.2       0       2.400    0    1      1

  2        1       26.5       0       1.300    0    1      1

  2        3       26.2       3       2.400    1    1      1

  3        3       25.6       7       2.800    1    1      1

  3        3       23.0       1       1.650    1    1      1

  3        3       23.0       0       1.800    0    1      1

  2        3       25.4       6       2.250    1    1      1

  3        3       24.2       0       1.900    0    1      1

  2        2       22.9       0       1.600    0    1      1

  3        2       26.0       3       2.200    1    1      1

  2        3       25.4       4       2.250    1    1      1

  3        3       25.7       0       1.200    0    1      1

  2        3       25.1       5       2.100    1    1      1

  3        2       24.5       0       2.250    0    1      1

  4        3       27.5       0       2.900    0    1      0

  3        3       23.1       0       1.650    0    1      1

  3        1       25.9       4       2.550    1    1      1

  2        3       25.8       0       2.300    0    1      1

  4        3       27.0       3       2.250    1    1      0

  2        3       28.5       0       3.050    0    1      1

  4        1       25.5       0       2.750    0    1      0

  4        3       23.5       0       1.900    0    1      0

  2        2       24.0       0       1.700    0    1      1

  2        1       29.7       5       3.850    1    1      1

  2        1       26.8       0       2.550    0    1      1

  4        3       26.7       0       2.450    0    1      0

  2        1       28.7       0       3.200    0    1      1

  3        3       23.1       0       1.550    0    1      1

  2        1       29.0       1       2.800    1    1      1

  3        3       25.5       0       2.250    0    1      1

  3        3       26.5       1       1.967    1    1      1

  3        3       24.5       1       2.200    1    1      1

  3        3       28.5       1       3.000    1    1      1

  2        3       28.2       1       2.867    1    1      1

  2        3       24.5       1       1.600    1    1      1

  2        3       27.5       1       2.550    1    1      1

  2        2       24.7       4       2.550    1    1      1

  2        1       25.2       1       2.000    1    1      1

  3        3       27.3       1       2.900    1    1      1

  2        3       26.3       1       2.400    1    1      1

  2        3       29.0       1       3.100    1    1      1

  2        3       25.3       2       1.900    1    1      1

  2        3       26.5       4       2.300    1    1      1

  2        3       27.8       3       3.250    1    1      1

  2        3       27.0       6       2.500    1    1      1

  3        3       25.7       0       2.100    0    1      1

  2        3       25.0       2       2.100    1    1      1

  2        3       31.9       2       3.325    1    1      1

  4        3       23.7       0       1.800    0    1      0

  4        3       29.3      12       3.225    1    1      0

  3        3       22.0       0       1.400    0    1      1

  2        3       25.0       5       2.400    1    1      1

  3        3       27.0       6       2.500    1    1      1

  3        3       23.8       6       1.800    1    1      1

  1        1       30.2       2       3.275    1    1      1

  3        3       26.2       0       2.225    0    1      1

  2        3       24.2       2       1.650    1    1      1

  2        3       27.4       3       2.900    1    1      1

  2        2       25.4       0       2.300    0    1      1

  3        3       28.4       3       3.200    1    1      1

  4        3       22.5       4       1.475    1    1      0

  2        3       26.2       2       2.025    1    1      1

  2        1       24.9       6       2.300    1    1      1

  1        2       24.5       6       1.950    1    1      1

  2        3       25.1       0       1.800    0    1      1

  2        1       28.0       4       2.900    1    1      1

  4        3       25.8      10       2.250    1    1      0

  2        3       27.9       7       3.050    1    1      1

  2        3       24.9       0       2.200    0    1      1

  2        1       28.4       5       3.100    1    1      1

  3        3       27.2       5       2.400    1    1      1

  2        2       25.0       6       2.250    1    1      1

  2        3       27.5       6       2.625    1    1      1

  2        1       33.5       7       5.200    1    1      1

  2        3       30.5       3       3.325    1    1      1

  3        3       29.0       3       2.925    1    1      1

  2        1       24.3       0       2.000    0    1      1

  2        3       25.8       0       2.400    0    1      1

  4        3       25.0       8       2.100    1    1      0

  2        1       31.7       4       3.725    1    1      1

  2        3       29.5       4       3.025    1    1      1

  3        3       24.0      10       1.900    1    1      1

  2        3       30.0       9       3.000    1    1      1

  2        3       27.6       4       2.850    1    1      1

  2        3       26.2       0       2.300    0    1      1

  2        1       23.1       0       2.000    0    1      1

  2        1       22.9       0       1.600    0    1      1

  4        3       24.5       0       1.900    0    1      0

  2        3       24.7       4       1.950    1    1      1

  2        3       28.3       0       3.200    0    1      1

  2        3       23.9       2       1.850    1    1      1

  3        3       23.8       0       1.800    0    1      1

  3        2       29.8       4       3.500    1    1      1

  2        3       26.5       4       2.350    1    1      1

  2        3       26.0       3       2.275    1    1      1

  2        3       28.2       8       3.050    1    1      1

  4        3       25.7       0       2.150    0    1      0

  2        3       26.5       7       2.750    1    1      1

  2        3       25.8       0       2.200    0    1      1

  3        3       24.1       0       1.800    0    1      1

  3        3       26.2       2       2.175    1    1      1

  3        3       26.1       3       2.750    1    1      1

  3        3       29.0       4       3.275    1    1      1

  1        1       28.0       0       2.625    0    1      1

  4        3       27.0       0       2.625    0    1      0

  2        2       24.5       0       2.000    0    1      1