title: Calculating checkboxes Apple Numbers after filtering
body: <p>In my numbers worksheet I create a table with the columns name, date and a column with checkboxes.</p>
  <p>And a second table with a cell that counts the checkboxes they returned true. I used this formule COUNTIF(A;WAAR)</p>
  <p>Now I created a filter on the column date but If I activate the filter the COUNTIF count all checkboxes if they are true and not only the filtered checkboxes with true.</p>
  <p>Who knows how I can create this in Apple Numbers?</p>