Terrance Odean provided evidence of the disposition effect using a database or aiscount orokerage usipe accounts. He computed the proportion of gains realized (PGR) and the proportion of losses realized (PLR) and found that there was no consistent pattern in transactions. PLRPGR.PLR=PGR. Terrance Odean provided evidence of the disposition effect using a database or aiscount orokerage usipe accounts. He computed the proportion of gains realized (PGR) and the proportion of losses realized (PLR) and found that there was no consistent pattern in transactions. PLRPGR.PLR=PGR.