Metric Glossary

Curious what goes into calculating some of our metrics? Check out our metric glossary for a full explanation.

Metrics:

• Unique Users
• New Users
• Sessions
• Crashes
• Time Spent Per User
• Time Spent Per Session
• Sessions Per User
• Occurrences (actions)

Unique Users

Unique users are calculated off of the unique identifier we retrieve from the mobile device. Based off of this value we will be able to tell you the total number of unique devices we have seen using your applications. This may not directly translate over to number of purchases in Apple's numbers as multiple devices may be attached to an iTunes account. Additionally development devices such as simulators will be counted separately in this metric.

New Users

The new users metric is calculated off of the unique identifier we get from a mobile device much like the unique users metric. The difference with this metric however is that we report the total number of unique devices we saw for the first time using an application for the requested date range.

Sessions

A session is defined as one application run. This metric is a sum of the total number of times an application was run for the requested date range.

Crashes

Crashes is a fuzzy metric which we can't report 100% accurately on but we can definitely give developers a general idea of how often their application is crashing. The data that we collect about an application sessions includes a start and end time of when the application was run. If we receive a beacon which doesn't have any end time we assume it was a crash since the application termination code never ran properly. The reason that this metric isn't 100% accurate is that in order to see these crashed sessions the application has to be relaunched so this data can be transmitted to our server. Potentially this means we will not see all crashed sessions or at least until a later date. If you are experiencing a high number of crashes this could be an indication that the analytics library is not implement properly and the endBeacon method is never being called. Additionally we have no insight into what cause the application to crash.

Time Spent Per User

The time spent per user metric is a combination of the unique users metric and duration values. Quite simply this metric will report the sum of all session durations divided by total number of unique users for the requested date range.

Time Spent Per Session

The time spent per session metric is a combination of the sessions and crashes metrics and the duration values. Since we do not have a duration for crashed sessions we ignore them while calculating this metric. The full calculation is sum of duration divided by the sum of sessions minus the sum of crashes.

Sessions Per User

Sessions per user is a combination of the sessions and unique users metrics. It reports on the sum of sessions divided by the sum of unique users.

Occurrences (actions)

This metric is unique to our statistics by action feature. It reports on the sum of how many times we saw an action occur.