The HDB Resale Price Index tracks the overall price movement of the public residential market. The index is calculated using resale transactions registered across various towns, flat types and models, with the fourth quarter of 1998 as the base period (i.e. index has value 100 in 4Q98).
The Index is used by comparing how it changes from one period from another. For example, if the index increases from 100 to 108 in one year, it means that on the whole, HDB resale flat prices increased by 8% over this period.