">Table 2.2: </span>Different scales of measurement admit different types of numeric operations</caption>
<thead>
<tr class="header">
<th align="left"></th>
<th align="left">Equal/not equal</th>
<th align="left">&gt;/&lt;</th>
<th align="left">+/-</th>
<th align="left">Multiply/divide</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td align="left">Nominal</td>
<td align="left">OK</td>
<td align="left"></td>
<td align="left"></td>
<td align="left"></td>
</tr>
<tr class="even">
<td align="left">Ordinal</td>
<td