ex2224: Valve Failure in Nuclear Reactors

In Sleuth2: Data Sets from Ramsey and Schafer's "Statistical Sleuth (2nd 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

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

str(ex2224)

Example output

'data.frame':	90 obs. of  7 variables:
 $ System  : Factor w/ 5 levels "containment",..: 1 1 1 2 2 2 2 2 2 2 ...
 $ Operator: Factor w/ 4 levels "air","solenoid",..: 3 3 3 1 1 1 1 1 1 1 ...
 $ Valve   : Factor w/ 6 levels "ball","butterfly",..: 4 4 5 2 3 3 5 5 5 5 ...
 $ Size    : Factor w/ 3 levels "<2","2-10","10-30": 3 3 1 2 2 2 1 1 2 2 ...
 $ Mode    : Factor w/ 2 levels "closed","open": 1 2 1 2 1 2 1 2 1 2 ...
 $ Failures: num  2 2 1 0 0 0 2 4 1 2 ...
 $ Time    : num  4 4 2 2 2 1 4 6 1 1 ...

Sleuth2 documentation built on May 2, 2019, 7:01 a.m.