This isn't as straightforward as it may seem
Market data will show the difference of last asking price vs. closing price which will give you a percentage around 5% off of ask. The problem with this is many of these homes were on the market for months & reduced their price by 10% before they finally got an offer on the last listed price.
Although the percentage stat for ask vs. close helps, each home has to be looked at in a case by case. Some homes come on the market priced to go & some are really over inflated.