
<p>This illustrates that <code><a href="https://rdrr.io/r/stats/anova.html" class="external-link">anova()</a></code> tests for linear models
are <em>sequential</em> tests. They test hypotheses about the extra
contribution of each variable over and above all previous ones, in a
given order. These usually do not make substantive sense, except in
testing ordered (‚Äúhierarchical‚Äù) models.</p>
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