0 0 0 0 0 0 0 0 00 1 1 1 1 0 1 1 01 0 1 0 0 1 1 1 01 1 0 1 1 1 0 0 00 0 1 1 1 0 1 1 1 10 1 0 0 0 1 1 0 11 0 1 0 1 0 0 0 11 1 1 1 0 1 0 1 10 0 1 0 1 1 1 1 20 1 1 0 0 0 0 21 0 0 1 0 1 0 1 21 1 0 1 1 0 1 0 20 0 0 1 0 1 1 0 30 1 1 1 0 0 1 31 0 0 0 1 0 0 1 31 1 1 0 1 1 1 0 30 0 1 1 1 1 0 0 40 1 0 0 1 1 0 1 41 0 1 1 0 0 1 0 41 1 0 0 0 0 1 1 4OA（20，2^8 5^1）J.Stufken教授统计部电子邮件：jstuwken@iastate.edu爱荷华州立大学电话：（515）294-7806爱荷华州艾姆斯市50011传真：（515）294-4040网址：http://www.public.iastate.edu/~jstuwken/