WTSD

(Went to Showdown)
stats

% of pots a player sees showdown after the flop.

Solid players: 25–28%. Calling stations: 35%+ (chase too many draws and pay off too often).

See also

VPIP
% of hands a player voluntarily enters (excludes blind posts).
Fold-to-CBet
% of times a player folds to a continuation bet.
Aggression Factor
(Bets + Raises) / Calls — how aggressively a player plays.