Valvefailure {gpk}

Valve characteristics and numbers of failures in a nuclear reactor

Description

Here the number of failures in a run is a Poisson variable with mean affected by the various factor combinations and also observation times. There are 5 factors. Note that all explanatory variables are of qualitative type and in regression they will have to be converted into a group of indicator columns each. If there are 2 categories a single indicator column suffices. If there are k categories we need k-1 columns.

Usage

data(Valvefailure)

Format

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

System

System (1=containment, 2= nuclear, 3=power conversion, 4= safety, 5= process auxiliary)

Operator

Operator type (1= air, 2= solenoid, 3=motor driven, 4= manual)

Valve

Valve type (1=ball, 2= butterfly, 3=diaphragm, 4= gate, 5= globe, 6= directional control)

Size

Head size (1= less than 2inches, 2= 2-10 inches, 3= 10-30 inches)

Mode

Operational mode (1= normally closed, 2= normally open)

Failures

Number of failures

Time

Observation times (multiplied by 43800) hours

Details

Poisson regression is recommended for this data set.

Source

http://ces.iisc.ernet.in/hpg/nvjoshi/statspunedatabook/databook.html