You guessed it right . . . we're talking about the study that is infamous before it's even been presented.The lead researcher of this long-delayed drug study says he regrets not standing up to Merck & Co. and Schering-Plough Corp. when they first told him last month that they planned to alter the statistical analysis of their jointly sponsored trial.Under mounting criticism, the companies last week reversed the earlier decision to change the primary measure to evaluate the drug. The study, called Enhance, tested 720 people to determine whether a combination of Schering-Plough's Zetia and Merck's now off-patent cholesterol fighter Zocor works better than Zocor alone.The WSJ has the story.