print</a></span>(<span class='no'>ap</span>)</div><div class='img'><img src='age_pyramid-11.png' alt='' width='700' height='433' /></div><div class='input'>
<span class='co'># empty group levels will still be displayed</span>
<span class='no'>dat3</span> <span class='kw'>&lt;-</span> <span class='no'>dat2</span>
<span class='no'>dat3</span>[<span class='no'>dat</span>$<span class='no'>AGE</span> <span class='kw'>==</span> <span class='st'>"[0,5)"</span>, <span class='st'>"sex"</span>] <span class='kw'>&lt;-