Description Format Details References Examples
The current formulation of a coating on transparencies used in ink-jet printers causes them to curl. These data are from experiments conducted on a new formulation of the coating to reduce the amount of curl.
A data frame with 12 observations on the following 3 variables.
catalyst
amount of catalyst
compa
amount of component a (the second component)
curl
a measure of the curl
These data were collected when transparencies were still widely used for presentations. With the proliferation of projectors, transparencies are being used less and less. However, coatings on paper will continue to be an area of research as coatings have to interact with a variety of printers and inks in order to be useful.
Peter R. Nelson, Marie Coffin and Karen A. F. Copeland (2003), Introductory Statistics for Engineering Experimentation, Elsevier. (Appendix A)
1 2 3 4 5 6 |
Loading required package: lattice
'data.frame': 12 obs. of 3 variables:
$ catalyst: num 0.45 0 0.225 0.45 0 0 0.45 0 0.225 0.225 ...
$ compa : num 3.345 0.885 3.345 3.345 0 ...
$ curl : int 69 29 69 92 26 55 67 47 75 66 ...
compa
catalyst 0 0.435 0.885 1.433 1.695 1.778 3.345
0 2 0 1 0 0 1 0
0.225 0 0 0 1 2 0 1
0.45 0 1 0 0 0 0 3
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