The good-vs-poor round analysis shows what a player does well when in his or her good rounds and what a player does poorly in his or her bad rounds.
In more detail, when two or more rounds are selected for reporting, the rounds are split into the best half and worst half based on SG Total. Then strokes gained (SG) analyses are run separately for the best rounds and worst rounds. Finally, the results are normalized to each player’s SG by subtracting the average SG (in each shot category) over all selected rounds.
Example: Suppose a player’s good round SG total is +3 and poor round SG total is -3 with an SG difference of 6. This means a player’s good rounds are 3 strokes better than the player’s average and poor rounds are 3 strokes worse. The 6-stroke difference is further split by shot category. For example, suppose the difference in drives is 1, approach is 2, short game is 0.5 and putting is 2.5. This indicates that a player scores the best when he or she is putting and hitting approach shots well (and also scores the worst when these parts of the game are off). Similar calculations are done for shot subcategories (e.g., putting 7-21 feet) and for driving distance.