hor" href="#details"></a></h2>
    <p>When the modeling was performed with <code>na.action = "na.omit"</code>
(as is the typical default), rows with NA in the initial data are omitted
entirely from the augmented data frame. When the modeling was performed
with <code>na.action = "na.exclude"</code>, one should provide the original data
as a second argument, at which point the augmented data will contain those
rows (typically with NAs in place of the new columns). If the original data
is not provided to <code