WWheat data frame has 60 rows and 3 columns.
This data frame contains the following columns:
an ordered factor with 10 levels
a numeric vector of yields
a numeric vector of soil moisture contents
Littel, R. C., Milliken, G. A., Stroup, W. W., and Wolfinger, R. D. (1996), SAS System for Mixed Models, SAS Institute (Data Set 7.2).
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