ex2224: Valve Failure in Nuclear Reactors

In Sleuth3: Data Sets from Ramsey and Schafer's "Statistical Sleuth (3rd Ed)"

Description

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

Usage

ex2224

Format

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

Source

Ramsey, F.L. and Schafer, D.W. (2013). The Statistical Sleuth: A Course in Methods of Data Analysis (3rd ed), Cengage Learning.

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

str(ex2224)

Example output

'data.frame':	90 obs. of  7 variables:
 $ System  : int  1 1 1 2 2 2 2 2 2 2 ...
 $ Operator: int  3 3 3 1 1 1 1 1 1 1 ...
 $ Valve   : int  4 4 5 2 3 3 5 5 5 5 ...
 $ Size    : int  3 3 1 2 2 2 1 1 2 2 ...
 $ Mode    : int  1 2 1 2 1 2 1 2 1 2 ...
 $ Failures: int  2 2 1 0 0 0 2 4 1 2 ...
 $ Time    : int  4 4 2 2 2 1 4 6 1 1 ...

Sleuth3 documentation built on May 2, 2019, 6:41 a.m.