t. p.20.
<a href="https://www.menzies.edu.au/icms_docs/172302_2000_Annual_report.pdf">https://www.menzies.edu.au/icms_docs/172302_2000_Annual_report.pdf</a>.
</p>
<p>Venables, W. N. and Ripley, B. D. (2002)
<em>Modern Applied Statistics with S.</em> Fourth edition.  Springer.
</p>


<h3>Examples</h3>

<pre><code class='language-R'>contrasts(bacteria$trt) &lt;- structure(contr.sdif(3),
     dimnames = list(NULL, c("drug", "encourage")))
## fixed effects analyses
summary(glm(y ~ trt * week, binomial, data = b