The Progress 8 score is a «reflection of relative differences in Attainment 8 performance, compared with pupils with the same prior attainment», Perry told Schools Week. (schoolsweek.co.uk)
Claxitone (2012) surveyed a study on 125 couples who are interested in opposite sex that got married for a long time, personality traits of both parties and relative differences of personality concepts as predictor of marital satisfaction. (scirp.org)
I would have thought a standard process in dendroclimatology would be to normalize based on relative difference within the same sample so absolute width would not be an issue. (realclimate.org)