[EM] CR/Approval method, RWE

[Chris Benham]

I  like Kevin 's  "another  CR/Approval  method", and  I think it would 
be good if  the name contained a reference to the
type of  ballot  used. Maybe something like  "Venzke Ratings"?
It has occurred to me that the method  is similar in concept to  "Runoff 
 Without Elimination". This quickly led me to
realise that RWE  could be simply improved  by instead of candidates 
being permanently "shunted", we adopt Kevin's
mechanism of  marking candidates (maybe temporarily) "not viable", and 
also we use Kevin's stopping rule (when all
but one candidate is marked "not viable").

"Inproved" RWE  (Venzke CR/Approval  adapted  for plain ranked ballots):

Ranked ballots, equal preferences and truncation ok.
First iteration: Count the first preference votes  and  mark the 
candidate with the lowest tally as "not viable".
Reset the tallies to zero.
Second iteration: Each ballot contributes a vote each (no split votes) 
to their favourite candidate/s of those not marked
"not viable", and also to any marked "not viable" for whom  they show 
equal or higher preference .Now mark the two
candidates with the lowest tallies as "not viable", and reset all 
tallies to zero.
And so on, each time marking as many candidates "not viable" as there 
have been iterations(inclusive). The tag expires if
it is not renewed at the next iteration. When all but one candidate is 
marked as "not viable" , then that candidate wins.

Chris Benham