class='va'>psydat</span><span class='op'>$</span><span class='va'>iq</span><span class='op'>)</span><span class='op'>)</span>
</div><div class='output co'>#&gt;    0    1 NA's 
#&gt; 4804   17  179 </div><div class='input'><span class='kw'>if</span> <span class='op'>(</span><span class='cn'>FALSE</span><span class='op'>)</span> <span class='op'>{</span>
<span class='va'>psydat</span> <span class='op'>%&gt;%</span> <span class='fu'>mutate_at</span><span class='op'>(</span><span class='fu'><a href='https://rd