Basic pitch count estimator

In baseball statistics, the basic pitch count estimator is a statistic used to estimate the number of pitches thrown by a pitcher where there is no pitch count data available. The formula was first derived by Tom Tango. The formula is ${\displaystyle 3.3PA+1.5SO+2.2BB}$,[1] where PA refers to the number of plate appearances against the pitcher, SO to strikeouts and BB to base on balls.
In 2007 the formula has been updated by Brian Yonushonis. This newer formula that he uses is: ${\displaystyle 3.29xPA+1.92*K+2.04*RBB-1.05*IBB-0.2*HA+PA*(0.755-PIP\%)}$[citation needed]