What is the difference between public and private Ratings?

For Google Play apps you will see two options for Ratings, public and private, as per the image below.

Public Ratings shows the Ratings which match what you see on the public page for that app in the app store – the same rating users who are browsing the app store will see. For Google Play apps the Public average star rating is calculated using Google’s weighted average Rating calculation; the details of the weighted average calculation are not publicly available.

Private Ratings means the Ratings that match what you see inside your developer console. These are calculated without any weightings applied to the average. The private data sometimes also shows a higher count of Ratings, as new Ratings appear in the console before they are seen publicly.

For authenticated apps “Private” will be selected by default. More information on authenticating your Google Play apps can be found here.