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    <h1>Add NA values to a dataframe</h1>
    <small class="dont-index">Source: <a href='https://github.com/rafzamb/sknifedatar/blob/master/R/insert_na.R'><code>R/insert_na.R</code></a></small>
    <div class="hidden name"><code>insert_na.Rd</code></div>
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    <p>allows adding NA values to a data frame, selecting the columns
and the proportion