| atLeast | gives a minimum estimated value for the approximate measurement. |
| atMost | gives a maximum estimated value for the approximate measurement. |
| min | where the measurement summarizes more than one observation
or a range, supplies the minimum value
observed. |
| max | where the measurement summarizes more than one observation
or a range, supplies the maximum value
observed. |
| confidence | The degree of statistical confidence (between zero and one) that a value falls within the range
specified by min and max, or the proportion of observed values that fall within that range. |