Motivation: Our source, the Land Registry, reports index and average price for Northern Ireland, but only in not seasonally adjusted (NSA) terms.

Response: For analytical consistency, we have created seasonally adjusted (SA) counterparts.

Properties: The start date (2005Q1) and units are identical for the two versions. Expect our SA series to be revised with each update. Supplemental series of this kind are marked in their source metadata with a secondary citation of "Moody's Analytics Adjusted."

The series reside in the historical catalog (United Kingdom » Real Estate » Residential » Prices » Land Registry House Price Index) and are:

• HPITRAQ.IGBR_NOIR = House Price Index: New and existing - Residential, (Index 2015Q1=100, SA)
• HPLTRAQ.IGBR_NOIR = House Price: New and existing - Residential - Average price, (GBP, SA)

Method: Adjust reported index and average price using the U.S. Census Bureau's X-13 ARIMA program.