How to Audit a LinkedIn Group - how many members, how engaged are they, who are your key influencers in the group.
NOTE as May 2015, LinkedIn closed down the open API that allowed Grytics to manage and measure groups remotely. Only approved Partners like Salesforce and Microsoft now have this data. yep I'm cross too. Will keep looking for a solution for you, but not holding my breath unless Grytics gets reapproved as a Partner.