====Change (Analytic Filter)====

===Description===
The **Change** filter is used to prevent output unless there has been a change to the incoming data.

This prevents redundant calls to your sinks.

The amount of change allowed can be set with the //threshold// parameter. This allows you to filter out small amounts of drift or error in the value.

===Parameters===
^Name^Default^Meaning^
|Threshold|0|The amount of change that can be safely ignored|

===Example===
<code>
<filter type="Change">
   <threshold>0.01</threshold>
</filter>
</code>

//Prevents output unless the value has changed by more than 0.01 (in either direction)//

==Example Input Sequence==
^Index^Value^
|07:00:00|10|

**Output Sent** (No Previous Values to Compare Against)

^Index^Value^
|07:10:00|10|

**No Output** (No Change Detected)

^Index^Value^
|07:20:00|10.01|

**No Output** (Change Does Not Exceed Threshold)

^Index^Value^
|07:30:00|11|

**Output Sent** (Change Exceeds Threshold)