In Discover, two metrics that appear to be similar are listed: Instances and Occurrences.


are the number of times a variable was defined in an image request.


are the total number of hits a variable value was either defined or (for conversion variables) persisted. The metric is in essence the sum of page views and page events.

Comparison of metrics

Occurrences higher than Instances: This outcome is expected for conversion variables, as occurrences also includes the number of times the variable was defined (instances).

Instances higher than Occurrences: This outcome is not possible in reporting, as all instances are recorded as occurrences as well.

Instances equal to Occurrences: This outcome is most common for traffic variables, as by nature they do not persist beyond the image request.


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