Description Usage Format Source References Examples

This data frame contains data on characteristics and numbers of
*failures* observed in valve types from one pressurised water
reactor.

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A data frame with 90 observations on the following 7 variables.

- System
a numerical code corresponding to 5 categories of system (1 = containment, 2 = nuclear, 3 = power conversion, 4 = safety, 5 = process auxiliary)

- Operator
a numerical code corresponding to 4 different operator types (1 = air, 2 = solenoid, 3 = motor=driven, 4 = manual)

- Valve
a numerical code corresponding to 6 different valve types (1 = ball, 2 = butterfly, 3 = diaphram, 4 = gate, 5 = globe, 6 = directional control)

- Size
a numerical code corresponding to 3 head size categories (1 = less than 2 inches, 2 = 2–10 inches, 3 = 10–30 inches)

- Mode
a numerical code corresponding to two categories of operation mode (1 = normally closed, 2 = normally open)

- Failures
Number of failures observed

- Time
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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Sleuth3 documentation built on May 31, 2017, 1:56 a.m.

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