The Machines data frame has 54 rows and 3 columns.
Format
This data frame contains the following columns:
Worker
an ordered factor giving the unique identifier for the worker.
Machine
a factor with levels
A,
B, and
C identifying the machine brand.
score
a productivity score.
Details
Data on an experiment to compare three brands of machines used in an
industrial process are presented in Milliken and Johnson (p. 285,
1992). Six workers were chosen randomly among the
employees of a factory to operate each machine three times. The
response is an overall productivity score taking into account the
number and quality of components produced.
Source
Pinheiro, J. C. and Bates, D. M. (2000), Mixed-Effects Models
in S and S-PLUS, Springer, New York. (Appendix A.14)
Milliken, G. A. and Johnson, D. E. (1992), Analysis of Messy Data,
Volume I: Designed Experiments, Chapman and Hall, London.
Examples
str(Machines)
Results
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> library(MEMSS)
Loading required package: lme4
Loading required package: Matrix
Attaching package: 'MEMSS'
The following objects are masked from 'package:datasets':
CO2, Orange, Theoph
> png(filename="/home/ddbj/snapshot/RGM3/R_CC/result/MEMSS/Machines.Rd_%03d_medium.png", width=480, height=480)
> ### Name: Machines
> ### Title: Productivity Scores for Machines and Workers
> ### Aliases: Machines
> ### Keywords: datasets
>
> ### ** Examples
>
> str(Machines)
'data.frame': 54 obs. of 3 variables:
$ Worker : Factor w/ 6 levels "1","2","3","4",..: 1 1 1 2 2 2 3 3 3 4 ...
$ Machine: Factor w/ 3 levels "A","B","C": 1 1 1 1 1 1 1 1 1 1 ...
$ score : num 52 52.8 53.1 51.8 52.8 53.1 60 60.2 58.4 51.1 ...
>
>
>
>
>
> dev.off()
null device
1
>