CASE STUDIES IN BIOMETRY: Chapter 2.
* http://lib.stat.cmu.edu/datasets/csb/
Assessing Toxicity of Pollutants in Aquatic Systems 

A. John Bailer, James T. Oris

The file ch2.dat contains the following variables:

   animal - a unique identifier associated with each C. dubia tested
     conc - concentration (micro grams/L)
   brood1 - number of young produced in the first brood
   brood2 - number of young produced in the second brood
   brood3 - number of young produced in the third brood
    total - sum of young produced in the 3 broods (=brood1 + brood2 + brood3)

	1	0	3	14	10	27
	2	0	5	12	15	32
	3	0	6	11	17	34
	4	0	6	12	15	33
	5	0	6	15	15	36
	6	0	5	14	15	34
	7	0	6	12	15	33
	8	0	5	13	12	30
	9	0	3	10	11	24
	10	0	6	11	14	31
	11	80	6	11	16	33
	12	80	5	12	16	33
	13	80	6	11	18	35
	14	80	5	12	16	33
	15	80	8	13	15	36
	16	80	3	9	14	26
	17	80	5	9	13	27
	18	80	7	12	12	31
	19	80	5	13	14	32
	20	80	3	12	14	29
	21	160	6	12	11	29
	22	160	6	12	11	29
	23	160	2	8	13	23
	24	160	6	10	11	27
	25	160	6	11	13	30
	26	160	6	13	12	31
	27	160	6	12	12	30
	28	160	5	10	11	26
	29	160	6	13	10	29
	30	160	6	12	11	29
	31	235	4	13	6	23
	32	235	6	10	5	21
	33	235	2	5	0	7
	34	235	6	0	6	12
	35	235	6	13	8	27
	36	235	6	0	10	16
	37	235	7	0	6	13
	38	235	4	2	9	15
	39	235	6	8	7	21
	40	235	7	0	10	17
	41	310	6	0	0	6
	42	310	6	0	0	6
	43	310	7	0	0	7
	44	310	0	0	0	0
	45	310	5	10	0	15
	46	310	5	0	0	5
	47	310	6	0	0	6
	48	310	4	0	0	4
	49	310	6	0	0	6
	50	310	5	0	0	5