In single-winner Score, some contend that a great candidate might lose because of having less name recognition i.e. someone scored 10/10 by 40% of voters and left blank by 60% could lose to someone with a 5/10 from all 100% of voters. To solve this, they use averaging that comes in various forms, so that basically candidates who were scored on less ballots get a boost relative to their actual scores and candidates scored on more ballots.
In PR, there are likely to be a lot of candidates running, so voters will probably prefer to leave blank candidates they dislike, rather than give all of them 0s. This means that any form of averaging will probably need to be very nonaggressive or it would artificially inflate bad candidates’ scores. So is there any form of averaging worth using for cardinal PR?