In USPSA, at a level one ( club) one stage that is a classifier stage.
Your score on that stage. So the stage Hit Factor, not the match is sent to USPSA and computed against others in the data base for that stage. That gives you a hitfactor for that stage nationally. Once you have a certain number of classifiers that is calculated for your classification.
area matches, regional and major matches will depend on the number of GM shooters and the scores they shoot and the whole match would count as a classifier.
IDPA, has one stage that is used for classification. It is up to the club when they run that stage and submit for your classification.