AHPR - What does AHPR stand for? The Free Dictionary
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We calculate AHPR by computing the HPR (as described above) for the sample firm and the HPR for its matched firm then subtracting the HPR of the matched firm from the HPR of the sample firm.
Interestingly, neither the HPR nor AHPR for this time period are statistically distinguishable from zero.
Although the average AHPR for our sample is negative (-2.