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.
System, factor with 5 levels
Operator type, factor with 4 levels
Valve type, factor with 6 levels
Head size, factor with 3 levels (less than 2 inches, 2–10 inches and 10–30 inches)
Operation mode, factor with 2 levels
Number of failures observed
Lengths of observation time
Ramsey, F.L. and Schafer, D.W. (2002). The Statistical Sleuth: A Course in Methods of Data Analysis (2nd ed), Duxbury.
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.