|The most constant players of the past 9 years|
To find out who were the most constant players of the past years I took
their year-end world rankings and calculated the standard deviation (which
indicates the variation around the mean value). The higher the standard
deviation, the more changes a player had in his year-end rankings.
The constancy is independent of the player's performance level, indicated by the mean value of his ranks in the corresponding period.
stddev mean Sampras, Pete 1.73 2.00 Krajicek, Richard 9.99 14.56 Rosset, Marc 15.44 30.11 Chang, Michael 15.94 13.78 Pioline, Cedric 17.78 30.22 Ferreira, Wayne 17.94 26.22 Ivanisevic, Goran 18.20 15.00 Fromberg, Richard 20.40 70.67 Tarango, Jeff 22.68 75.33 Clavet, Francisco 23.16 41.67