Why eFG% Is Invalid for Measuring the Efficiency of FG Shooting

Whenever you see basketball performance analysis where eFG% is used as the metric to measure the efficiency of FG shooting, you immediately know that the whole analysis is invalid. Since eFG% is widely used, much of the current basketball performance analysis is invalid.

Nothing helps: not the huge amount of the data, not the sophistication of the analysis methods, not the great looks of the graphics. In a way, they only make matters worse since they help hide the invalidity of the underlying assumptions.

Continue reading

Five Factors – or Improving the Validity of Four Factors

Four Factors, developed by Dean Oliver, is a widespread concept in basketball performance analysis. Yet there is a serious flaw in it: it uses eFG% to measure the efficiency of field goal shooting. This is an invalid procedure, as shown here.

What then would be a valid indicator for the efficiency of field goal shooting within the framework of Four Factors?

Continue reading