Use Facebook Analytics for Apps to measure the performance of invites to your app. To get started open Analytics and navigate to Invites in the Integrations tab.
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Attributing installs for App Invites relies on the activateApp App Event. In order to see accurate installation figures on the analytics dashboard you will need to be logging this event correctly.
Visit the relevant documentation for each platform you are using App Invites on, linked below, to learn more.
activateApp for each Platform:
You can view each stage of the app invites funnel from the dialog open to the invite accept. This allows you to identify problems and address them faster.

You can break down each view by platform to further explore conversions at each stage.