Proposed dataset: Bank of Lithuania repeat-sales house price index

[matas-star]

Proposed dataset

Bank of Lithuania repeat-sales house price index (RSHPI/PSBKI), normalized as
a versioned Frictionless Data Package.

Why it may fit Core Data

• Official monthly housing-market indicator for dwellings in multi-dwelling
  buildings from Lithuania's central bank.
• Indicator/time-series data covering 2006-01 through 2026-06.
• Lithuania plus Vilnius, Kaunas, and Klaipėda city municipalities.
• Index (2015 = 100), monthly change, and annual change.
• Maintained, versioned Git repository with CSV, datapackage.json, provenance,
  checksums, and a citation file.
• Stable v2026.06 release and Software Heritage snapshot.

The normalized dataset currently contains 2,952 metric observations. Each row
retains the Bank of Lithuania source code. A completeness gate prevents a
partial upstream response from replacing the verified publication.

Important methodological limitation

This is a repeat-sales index for dwellings in multi-dwelling buildings, not an
average or median transaction price and not a price in EUR per square metre.
The Bank of Lithuania calculates it from sales of the same dwelling sold at
least twice.

Links

• Repository: https://github.com/matas-star/lt-real-estate-prices
• Stable release: https://github.com/matas-star/lt-real-estate-prices/releases/tag/v2026.06
• Data Package: https://github.com/matas-star/lt-real-estate-prices/blob/master/datapackage.json
• English documentation: https://github.com/matas-star/lt-real-estate-prices/blob/master/README.en.md
• Primary source and methodology: https://www.lb.lt/en/repeat-sales-house-price-index
• Normalization methodology: https://bustoduomenys.lt/en/
• Versioned JSON API: https://bustoduomenys.lt/api/v1/psbki.json

Update and maintenance

The source is checked daily. Publication only changes when the official latest
month changes and the expected territorial/indicator completeness checks pass.
I maintain the normalized package.

Licensing question

The Bank of Lithuania's information-use terms ask reusers to identify the Bank
of Lithuania as the source:
https://www.lb.lt/lt/informacijos-naudojimo-salygos

The upstream page does not name a standard SPDX/Open Definition licence. The
package therefore declares license: other and links to the exact upstream
terms; it does not relabel the data as CC0 or PDDL. Would those attribution
terms meet the Commons/Core acceptance policy, or is an explicit standard open
licence required before this can be accepted?

Disclosure

I maintain the normalization repository and bustoduomenys.lt. The statistical
source and methodology are the Bank of Lithuania's; this proposal does not
claim official endorsement of the normalized package.