boilers: boilers: Erecting Boiler Drums

In thoree/stat340: Data and functions for BIAS at NMBU

boilers: Erecting Boiler Drums

Description

This data contains man-hours required to erect boiler drums of two types: steam and mud drums. A manufacturer of boiler drums wants to use regression to predict the number of hours needed to erect the drums in future projects. To accomplish this, information of 35 boilers were collected; the boiler design pressure in pounds per square inch (PSI), boiler capacity and if the boiler was industry field erected or utility field erected.

Usage

boilers

Format

A data frame with 36 observations (rows) and 5 variables (columns).

	Column name	Data type	Description	Values
[,1]	Hours	integer	Man-hours	(1200 - 14791)
[,2]	Capacity	integer	Boiler capacity in lb/hour	(30000 - 1089490)
[,3]	Pressure	integer	Boiler design pressure in PSI	(250 - 2170)
[,4]	Boiler	integer	1 if industry erect, otherwise 0	(0 - 1)
[,5]	Drum	integer	Steam drum = 1, mud drum = 0	(0 - 1)

Details

A boiler is used to provide hot water or steam for heating. The steam drum is located in the upper drum of a boiler and used to store the steam generated in water-tube boilers. A mud drum, which is the lower drum, can be added to the system to collect and remove sediments and mud in the water.

This data is from Exercise 4.74 in A second course in statistics: Regression Analysis, 7th edition.

Source

Mendenhall, W., Sincich, T. (2012) A second course in statistics: Regression Analysis, 7th edition. Pearson Education.

Examples

# First eight rows
head(boilers, n = 8)

# Man-hours for industry erected mud boiler drums
idx <- which(boilers$Boiler == 1 & boilers$Drum == 0)
boxplot(boilers$Hours[idx] ~ boilers$Pressure[idx])

thoree/stat340 documentation built on June 30, 2024, 4:04 p.m.