or</dt>
<dd><p>standard error</p></dd>
<dt>statistic</dt>
<dd><p>t- or Z-statistic (<code>NA</code> for modes)</p></dd>
<dt>p.value</dt>
<dd><p>P-value computed from t-statistic (may be missing/NA)</p></dd>
</dl><p><code>augment</code> returns one row for each original observation,
with columns (each prepended by a .) added. Included are the columns</p>
<dl><dt>.fitted</dt>
<dd><p>predicted values</p></dd>
<dt>.resid</dt>
<dd><p>residuals</p></dd>
<dt>.fixed</dt>
<dd><p>predicted values with no random effec