REFERENCES

Duncan, A.J. ( January 1948 ). Detection of non random variations when size of sample varies, Industrial Quality Control , pp. 9 “12.

Duncan, A.J. ( 1986 ). Quality Control and Industrial Statistics , Irwin, Homewood, IL.

Stevens, W.L. ( 1939 ). Distribution of groups in a sequence of alternatives, Annals of Eugenics , 9 (Part I), pp. 10 “17.

Swed, S. and Eisenhart, C. ( 1943 ). Tables for testing randomness of grouping in a sequence of alternatives, Annals of Mathematical Statistics , 14, pp. 66 “82.

Wald, A. and Wolfowitz, J. ( 1940 ). On a test whether two samples are from the same population, Annals of Mathematical Statistics , 11, pp. 147 “62.