The Fatigue data frame has 262 rows and 3 columns.
Format
This data frame contains the following columns:
Path
the test path (or test unit) identifier - a factor with levels
A to U.
cycles
number of test cycles at which the measurement is made
(millions of cycles).
relLength
relative crack length (dimensionless).
Details
These data are given in Lu and Meeker (1993) where they state
“We obtained the data in Table 1 visually from figure 4.5.2 on page 242
of Bogdanoff and Kozin (1985).”
The data represent the growth of cracks in metal for 21 test units.
An initial notch of length 0.90 inches was made on each unit which then
was subjected to several thousand test cycles. After every 10,000
test cycles the crack length was measured. Testing was stopped if the
crack length exceeded 1.60 inches, defined as a failure, or at 120,000
cycles.
Source
Lu, C. Joseph , and Meeker, William Q. (1993), Using degradation
measures to estimate a time-to-failure distribution,
Technometrics, 35, 161-174
R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
Copyright (C) 2016 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)
R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.
R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.
Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.
> 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/Fatigue.Rd_%03d_medium.png", width=480, height=480)
> ### Name: Fatigue
> ### Title: Cracks caused by metal fatigue
> ### Aliases: Fatigue
> ### Keywords: datasets
>
> ### ** Examples
>
> require(lattice)
Loading required package: lattice
> str(Fatigue)
'data.frame': 262 obs. of 3 variables:
$ Path : Factor w/ 21 levels "1","10","11",..: 1 1 1 1 1 1 1 1 1 1 ...
$ cycles : num 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 ...
$ relLength: num 1 1.06 1.11 1.17 1.24 ...
> xyplot(relLength ~ cycles | Path, Fatigue, type = c("g", "b"),
+ aspect = 'xy', xlab = "Number of test cycles (millions)",
+ ylab = "Relative crack length (dimensionless)",
+ layout = c(7,3))
>
>
>
>
>
> dev.off()
null device
1
>