With his otion you can indicate that you only want to perform the operation on a restricted range of the data. Data points not satisfying the criterion are set to undefined and are not used.

There are four ways in which the range can be specified

• If only the first field is filled out, only data larger than the threshold are considered.
• If only the second field is filled out, only data smaller than the threshold are considered.
• If both fields are filled in, and the first is smaller than the second, only data in the range between these values are considered.
• If both fields are filled in, and the first is larger than the second, only data outside the range are considered.

The tresholds can be entered as an absolute value or as a percentage. The latter is indicated by a "%" after he number.

Note that the thresholds are enforced after all other operations (seasonal means, anomalies, log/sqrt, etc) have been perfomed on the data.

It is advisable to first try out these ranges on a time series before attempting to use them on a field. This way the results are clear from the plots.