Bond data frame has 21 rows and 3 columns of data on the
strength required to break metal bonds according to the metal and
This data frame contains the following columns:
a numeric vector of pressures required to break the bond
a factor with levels
indicating the metal involved (copper, iron or nickel).
an ordered factor indicating the ingot of the composition material.
Littel, R. C., Milliken, G. A., Stroup, W. W., and Wolfinger, R. D. (1996), SAS System for Mixed Models, SAS Institute (Data Set 1.2.4).
Mendenhall, M., Wackerly, D. D. and Schaeffer, R. L. (1990), Mathematical Statistics, Wadsworth (Exercise 13.36).
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