There are a number of ways/tools to identify and/or mitigate install fraud today. If you are resource constrained and not interested in subscribing to some of the fraud management tools out there then this technique will help you identify fraudulent installs.
Install Fraud: Measure Lag Time Variation
On average your app shouldn’t be bigger than 100MB (as recommended by iTunes). Knowing this means at the very minimum it would take a new user 20 seconds or more to install and load your app, right?
The below chart illustrates installs after clicks by seconds.
In this case, the chart depicts (in red) that 5% of installs are fraudulent. Why: because it is not technically possible to install and fire up your app in under that time.
Having this information will allow you to easily include claw backs in your legal agreements with the various networks to refund the % of installs that have been identified as fraudulent.
What are some of the techniques you use to combat install fraud?