This data frame contains data on characteristics and numbers of failures observed in valve types from one pressurised water reactor.
A data frame with 90 observations on the following 7 variables.
a numerical code corresponding to 5 categories of system (1 = containment, 2 = nuclear, 3 = power conversion, 4 = safety, 5 = process auxiliary)
a numerical code corresponding to 4 different operator types (1 = air, 2 = solenoid, 3 = motor=driven, 4 = manual)
a numerical code corresponding to 6 different valve types (1 = ball, 2 = butterfly, 3 = diaphram, 4 = gate, 5 = globe, 6 = directional control)
a numerical code corresponding to 3 head size categories (1 = less than 2 inches, 2 = 2–10 inches, 3 = 10–30 inches)
a numerical code corresponding to two categories of operation mode (1 = normally closed, 2 = normally open)
Number of failures observed
Lengths of observation time
Ramsey, F.L. and Schafer, D.W. (2013). The Statistical Sleuth: A Course in Methods of Data Analysis (3rd ed), Cengage Learning.
Moore, L.M. and Beckman, R.J. (1988). Appropriate One-Sided Tolerance Bounds on the Number of Failures using Poisson Regression, Technometrics 30: 283–290.
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