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In this paper we discuss two types of roles for comparing several processes or populations with a standard. The rules are given in a general setting and comparisons of the rules are provided. Details of construction and modifications of the rules are given when each of the processes is characterized by two types of random variables x and y having exponential distributions with mans λ and μ respectively, and processes are compared in terms of θ = λ/μ.
Umesh D. Naik (Wed,) studied this question.