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typo: categorcal -> categorical (#524)

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Sam Firke 2017-05-03 08:42:10 -04:00 committed by Hadley Wickham
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model-basics.Rmd
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@ -346,7 +346,7 @@ model_matrix(df, y ~ x1 + x2)
This formula notation is sometimes called "Wilkinson-Rogers notation", and was initially described in _Symbolic Description of Factorial Models for Analysis of Variance_, by G. N. Wilkinson and C. E. Rogers <https://www.jstor.org/stable/2346786>. It's worth digging up and reading the original paper if you'd like to understand the full details of the modelling algebra. This formula notation is sometimes called "Wilkinson-Rogers notation", and was initially described in _Symbolic Description of Factorial Models for Analysis of Variance_, by G. N. Wilkinson and C. E. Rogers <https://www.jstor.org/stable/2346786>. It's worth digging up and reading the original paper if you'd like to understand the full details of the modelling algebra.
The following sections expand on how this formula notation works for categorcal variables, interactions, and transformation. The following sections expand on how this formula notation works for categorical variables, interactions, and transformation.
### Categorical variables ### Categorical variables