r>
  </thead>
  <tbody>
    <tr>
      <th>duration</th>
      <td>-</td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
    </tr>
    <tr>
      <th>frequency</th>
      <td>-0.89**</td>
      <td>-</td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
    </tr>
    <tr>
      <th>num_bets</th>
      <td>0.63**</td>
      <td>-0.45**</td>
      <td>-</td>
      <td></td>
      <td></td>
      <td