Description

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

Usage

Format

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

System

System, factor with 5 levels

Operator

Operator type, factor with 4 levels

Valve

Valve type, factor with 6 levels

Size

Head size, factor with 3 levels (less than 2 inches, 2–10 inches and 10–30 inches)

Mode

Operation mode, factor with 2 levels

Failures

Number of failures observed

Time

Lengths of observation time

Source

Ramsey, F.L. and Schafer, D.W. (2002). The Statistical Sleuth: A Course in Methods of Data Analysis (2nd ed), Duxbury.

References

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.

Examples