Statistical processing

Source data

The rent index is based on a representative sample of the property categories residential, retail, office, and industrial, which are leased by private individuals or businesses. The sample includes approximately 102,000 properties (approximately 84,000 rental residences, 6,000 retail leases, 3,000 office leases, 6,000 industrial leases, and approximately 3,000 other properties). The data is based on administrative data collected by DEAS and Resights.

Frequency of data collection

Quarterly.

Data collection

Data is collected by DEAS and Resights, which forward the information to Statistics Denmark electronically via a system-to-system transfer.

Data validation

The statistics include only actual observations (non-imputed or estimated) of rental units with no vacancy between two consecutive quarters and where residential use is the sole purpose of use. The submitted data is checked for large fluctuations in rent compared to the previous period, and implausible observations are automatically removed. After data validation, the dataset consists of approximately 61,000 commercial leases.

Data compilation

For each property category, the change in average rent between two consecutive quarters is calculated at the lease level (Dutot index principle). Only commercial leases for which a rent was recorded in both periods are included to avoid composition effects. These lease indices are then aggregated to the national level using annually updated value weights for municipalities (Laspeyres index principle).

At the start of the first quarter of a new year, the value weights are updated using the fourth quarter of the previous year as the price reference period. Any newly added housing units are included in the index with a base value of 100 from that point onward.

Adjustment

No corrections are made to the data beyond what has already been described under Data validation and Data compilation.