#2 You can change the aggregation for a particular field in the report editor
The aggregation method changed via report editor can override the default aggregation and apply a different one to the field on a chart.
#3 You can use specific aggregation functions within a calculated field formula to create a new aggregated field
Here, COUNT_DISTINCT is an aggregation function used with a calculated field formula to create a new aggregated field called ‘Total number of customers’.
Default Aggregation
The default aggregation determines how a field, by default, is aggregated and displayed in one or more charts of a report.
You can apply the following default aggregations to fields in your data source schema:
None – Use this aggregation type when you don’t want to apply any aggregation to a data source field.
Sum – Use this aggregation type when you want a numeric field to be aggregated and displayed (in one or more charts of a report) by default, as the sum of all of the values of the field.
Average – Use this aggregation type when you want a numeric field to be aggregated and displayed (in one or more charts of a report) by default, as the average of all of the values of the field.
Count – Use this aggregation type when you want a field to be aggregated and displayed by default, as the total count of all of the values of the field.
Count distinct – Use this aggregation type when you want a field to be aggregated and displayed by default, as the total count of all of the unique values of the field.
Min – Use this aggregation type when you want a numeric field to be aggregated and displayed by default, as the minimum value of the field.
Max – Use this aggregation type when you want a numeric field to be aggregated and displayed by default, as the maximum value of the field.
Median – Use this aggregation type when you want a numeric field to be aggregated and displayed by default, as the median value of the field. A median is a middle number in the sorted list of numbers.
Standard Deviation – Use this aggregation type when you want a numeric field to be aggregated and displayed by default, as the standard deviation of the values of the field. The standard deviation is a measure of the amount of variation of a set of values.
Variance – Use this aggregation type when you want a numeric field to be aggregated and displayed by default, as the variance of the values of the field. The variance measures how far a set of numbers are spread out from their average value.
How to do data aggregation in Looker Studio
Auto Aggregation
The data source fields that are already aggregated have the default aggregation of ‘auto’ and you can not change the aggregation methods of such field.
Data Sources like Google Analytics and Google Ads show ‘None’ as the only available aggregation type for most dimensions and ‘Auto’ as the only available aggregation type for most metrics. And you can not change the aggregation methods of such fields:
A calculated field that uses an aggregation function in its formula becomes a pre-aggregated field. Therefore its default aggregation is set to ‘auto’ which can not be changed.
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