You can see the top engaged people (people who posted, commented or reacted) on your interface (Members metrics).

To get the full list of people, you can export the list of members in Members metrics > Members list. Then, you can remove people with a score of 0 to get the number of people who generate any engagement.

“Seen by” is a post metric that counts the number of people who've viewed a post, so you have it for all type of posts. On the other hand, “Views by” are only for videos and it’s the number of time the video has been played.

To know this answer, you must export the list of members in Members metrics > List of members in Excel format. In Excel, you will have a "claimed_date" column, if no date is available, the account has not been claimed.

The metrics are calculated only on the groups that you have added in Grytics via the Manage > Add groups menu.

Sentiment score : percent of positive publications + percent of neutral publications.
Percent of positive publications : (number of positive publications * 100)/ number of publications analyzed.
Percent of negative publications : (number of negative publications * 100)/ number of publications analyzed.
Percent of neutral publications : (number of neutral publications * 100)/ number of publications analyzed.
Percent of mixed publications : (number of mixed publications * 100)/ number of publications analyzed.