China’s statistics agency said it will stop publishing the country’s much-watched official index of national property prices, scrapping a set of data whose accuracy was widely questioned but which also had become a rallying point for public anger over rapidly rising housing prices. The announcement Wednesday, part of a broader revision of property-price data by the National Bureau of Statistics, fueled already widespread frustration and skepticism about the quality and transparency of economic data in the world’s second largest economy. It came just a day after the statistics bureau published a lower-than-expected inflation reading based on a revised formula for the consumer-price index that economists criticized as lacking transparency.