WPM. The maximum error of the unit is a fixed percentage of the total votes cast in the unit. Typically the 20% WPM is used--meaning a swing of 40% is the largest error possible as 20% of the votes go from the winner to the loser.
fractionOfVotesBound(Z, frac = 0.4)
The elec.data object.
Fraction of total votes that could be a winner overstatement/loser understatement. So if the worst-case is a 20% flip then enter 0.4
maximumMarginBound