[EL] Studies On Partisan Bias In Redistricting Commission Maps

[Steven John Mulroy (smulroy)]

Does anyone know of any good, relatively recent studies evaluating redistricting maps drawn by US state redistricting commissions, analysing the extent to which they are perfect matchups of votes to seats, or whether they have any partisan bias? I'm interested in not only how redistricting commissions generally compare to regular redistricting plans on this score, but also, how truly independent redistricting commissions compare with less independent commissions.  (I realize this distinction might be subjective, but I'm assuming the studies could evaluate redistricting commissions on the extent to which legislators are allowed to be a member, the extent to which they take an "equal number of Democrats and Republicans" approach versus using avowedly nonpartisan members, retired judges, etc., as members, that sort of thing.) 

Thanks in advance.