No, it is available to all LinkedIn members.

Your combined post analytics in your Posts tab gives you insights into the combined performance of your posts over time. You can filter by impressions or engagements to see how those metrics are performing over your chosen date range. Additionally, the top performing posts section shows a preview of up to three of your top performing posts.

Your audience analytics in your Audience tab gives you insight into your follower growth over time and also gives you demographic breakdowns that can help you better understand who your followers are.

Your % change in impressions or engagements is calculated by comparing our total count within the current date range to the total count in the previous date range.

Yes, it is possible to see negative engagement values on the trend graph if you receive fewer engagements on that day than the total number of “removed” engagements (An engagement is considered “removed” if a member removes a reaction, deletes a comment, etc.). The engagement count at the top reflects your total number of engagements in the given time range, whereas the trend graph shows your engagement changes per day.

Your % change in followers is calculated by comparing your total follower count within the current date range to the total count in the previous date range.