fiber: Fiber data
In emmeans: Estimated Marginal Means, aka Least-Squares Means
fiber R Documentation
Fiber data
Description
Fiber data from Montgomery Design (8th ed.), p.656 (Table 15.10). Useful as a
simple analysis-of-covariance example.
Usage
fiber
Format
A data frame with 15 observations and 3 variables:
machinea factor with levels A B C.
This is the primary factor of interest.
strengtha numeric vector. The response variable.
diametera numeric vector. A covariate.
Details
The goal of the experiment is to compare the mean breaking strength of fibers
produced by the three machines. When testing this, the technician also
measured the diameter of each fiber, and this measurement may be used as a
concomitant variable to improve precision of the estimates.
Source
Montgomery, D. C. (2013) Design and Analysis of Experiments
(8th ed.). John Wiley and Sons, ISBN 978-1-118-14692-7.
Examples
fiber.lm <- lm(strength ~ diameter + machine, data=fiber)
ref_grid(fiber.lm)
# Covariate-adjusted means and comparisons
emmeans(fiber.lm, pairwise ~ machine)
emmeans documentation built on Oct. 14, 2024, 5:07 p.m.
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| fiber | R Documentation |
Fiber data
Description
Fiber data from Montgomery Design (8th ed.), p.656 (Table 15.10). Useful as a simple analysis-of-covariance example.
Usage
fiber
Format
A data frame with 15 observations and 3 variables:
machinea factor with levels
ABC. This is the primary factor of interest.strengtha numeric vector. The response variable.
diametera numeric vector. A covariate.
Details
The goal of the experiment is to compare the mean breaking strength of fibers produced by the three machines. When testing this, the technician also measured the diameter of each fiber, and this measurement may be used as a concomitant variable to improve precision of the estimates.
Source
Montgomery, D. C. (2013) Design and Analysis of Experiments (8th ed.). John Wiley and Sons, ISBN 978-1-118-14692-7.
Examples
fiber.lm <- lm(strength ~ diameter + machine, data=fiber)
ref_grid(fiber.lm)
# Covariate-adjusted means and comparisons
emmeans(fiber.lm, pairwise ~ machine)
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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