Data obtained from Daniel's "Applied Nonparametric Statistics", 2nd ed.
Response=Verbal IQ for 1st grade children
1=Very isolated
2=Moderately isolated
3=Rural non-isolated
4=Urban ghetto
21  1
22  1
20  1
22  1
25  1
28  1
22  1
23  1
20  1
44  1
27  1
30  1
33  2
27  2
29  2
29  2
26  2
29  2
26  2
35  2
33  2
34  2
36  2
40  2
45  2
34  2
26  2
34  2
33  2
33  2
32  2
42  2
28  2
34  2
44  2
36  3
35  3
33  3
35  3
39  3
37  3
30  3
33  3
35  3
35  3
27  3
42  3
41  4
43  4
44  4
37  4
36  4
36  4
42  4
32  4
43  4
25  4
25  4
38  4
34  4
42  4
40  4
45  4
37  4
28  4
24  4
40  4
42  4
41  4
45  4