 following objects are masked from nhanes:</span>
<span class="r-msg co"><span class="r-pr">#&gt;</span> </span>
<span class="r-msg co"><span class="r-pr">#&gt;</span>     age, educ, income</span>
<span class="r-msg co"><span class="r-pr">#&gt;</span> The following objects are masked from Mroz87 (pos = 8):</span>
<span class="r-msg co"><span class="r-pr">#&gt;</span> </span>
<span class="r-msg co"><span class="r-pr">#&gt;</span>     age, educ</span>
<span class="r-msg co"><span class="r-pr">#&gt;</span> The