dhaze {EngrExpt}

Haze of lenses after abrasion

Description

Haze of lenses after 150 test cycles of abrasion

Usage

data(dhaze)

Format

A data frame with 28 observations on the following 2 variables.

treatment

a factor with levels A, B, C and D

dhaze

a numeric vector

Details

A maker of coatings for eye glass lenses tested three treatments (or coating formulations) for the ability to withstand wear (simulated with an abrasion test) as measured by haze. Low haze is desirable.

References

Peter R. Nelson, Marie Coffin and Karen A. F. Copeland (2003), Introductory Statistics for Engineering Experimentation, Elsevier. (Appendix A)

Examples

str(dhaze)