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This method will give the same results as the instantaneoustoMean transformation while setting the includeFirstValueOfAggregationPeriodInCalculation option to false. However, it has no option to ignore missing values in the input series.
Configuration example
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<transformation id="aggregation MeanToMean">
<aggregation>
<meanToMean>
<inputVariable>
<timeSeriesSet>
<moduleInstanceId>ImportTelemetry</moduleInstanceId>
<valueType>scalar</valueType>
<parameterId>H.obs</parameterId>
<locationSetId>hydgauges</locationSetId>
<timeSeriesType>external historical</timeSeriesType>
<timeStep unit="minute" multiplier="15"/>
<relativeViewPeriod unit="day" startOverrulable="true" start="-7" end="0"/>
<readWriteMode>read only</readWriteMode>
<delay unit="minute" multiplier="0"/>
</timeSeriesSet>
</inputVariable>
<outputVariable>
<timeSeriesSet>
<moduleInstanceId>Aggregate_Historic</moduleInstanceId>
<valueType>scalar</valueType>
<parameterId>meanToMean</parameterId>
<locationSetId>hydgauges</locationSetId>
<timeSeriesType>external historical</timeSeriesType>
<timeStep unit="hour" multiplier="1"/>
<relativeViewPeriod unit="day" startOverrulable="true" start="-7" end="0"/>
<readWriteMode>add originals</readWriteMode>
<synchLevel>1</synchLevel>
</timeSeriesSet>
</outputVariable>
</meanToMean>
</aggregation>
</transformation>
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