Lubricant: Viscosity of lubricants

In NRAIA: Data sets from "Nonlinear Regression Analysis and Its Applications"

Description

The Lubricant data frame has 53 rows and 3 columns on the viscosity of a lubricant at different pressures and temperatures.

Format

This data frame contains the following columns:

pressure

a numeric vector of pressures (stokes).

viscos

a numeric vector of observed log(kinematic viscosity).

tempC

a numeric vector of temperatures (degrees Celsius).

Source

Bates and Watts (1998), Nonlinear Regression Analysis and Its Applications, Wiley (Appendix A1.5).

Examples

str(Lubricant)
tempf <- as.factor(Lubricant$tempC)
levels(tempf) <- paste(c(0.0,25.0,37.8,98.9),"C")
xyplot(viscos ~ pressure, Lubricant, groups = tempf,
     xlab = "Pressure (atm)", type = c("g", "p"),
     ylab = "kinematic viscosity (stokes)",
     scales = list(y = list(log = 2)),
     auto.key = list(space = "top", columns = 4))
rm(tempf)

NRAIA documentation built on May 2, 2019, 4:52 p.m.