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Configure the Aggregation widget as follows:

1. Configure general parameters (see General widget settings).
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2. Select the field to aggregate the data by (1).

3. If non-numeric fields are selected, then in the Aggregate op field, select 

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1. count (2) -the number of events will be counted. If a numeric field is selected, then you can select the sum, average, minimum and maximum value.

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   title Note
   In the example on the image above, the widget shows the minimum age of a recognized person for each video camera.

   
   

2. Click Save.