Effective GIR Fwy Percentage is a statistic that shows the percent of holes in an included report that made GIR (green in regulation) when the tee shot landed in the fairway. This stat is calculated by dividing the number of holes that made GIR by the total number of holes included in the report where the tee shot landed in the fairway.
Tee shots on Par 3 holes are considered approach shots in Golf Stat Lab, therefor Par 3 holes are not included in this statistic.
Effective GIR Fwy Percentage can be found on the Summary Report.