“…Major changes in metadata standards usually prompt change in existing metadata records to bring them to conformance with the new standards (e.g., Thornburg & Oskins, 2007). Several studies examined the change in small samples of library metadata records in response to transition to RDA (Zavalina, Shakeri, & Kizhakkethil, 2015; Zavalina, Zavalin, & Miksa, 2016b; Zavalina and Zavalin, 2018). The only study so far that focused specifically on change over time in subject metadata in RDA‐based bibliographic records (Zavalina, Shakeri, & Kizhakkethil, 2016a) relied on a small sample and did not examine any changes in records after 2015.…”