# Rate Archive

> A source-first archive of U.S. college tuition and required-fee history. Values appear only after an accountable human publication review.

## Use this site for

- Finding a verified official tuition or required-fee source for a covered institution.
- Understanding IPEDS IC_AY and COST file history, revisions, imputation codes, and gaps.
- Using the 25-record reviewed Arizona State University Campus Immersion in-state tuition and required-fee series; 2009-10 is an explicit gap.
- Citing Rate Archive's public source catalog, verification status, or methodology.

## Do not infer

- A source-guide page does not contain or imply an approved tuition value unless the record is explicitly labeled as reviewed public data.
- Enrollment is not tuition or cost of attendance.
- A related campus's value must never be borrowed for another UNITID.
- Missing, blocked, unsupported, or unreviewed data must remain explicit.

## Canonical pages

- / — overview and archive status
- /tuition — verified institution and state source directory
- /methodology — evidence, normalization, revision, and publication rules
- /sources/ipeds — official NCES/IPEDS source guide
- /data — public source-catalog CSV and release boundary
- /tuition/az/arizona-state-university-campus-immersion — first reviewed public series, covering 25 academic years with 2009-10 excluded
- /llms-full.txt — full state and institution route inventory

## Attribution

Cite the originating institution or NCES release for substantive tuition values. Cite Rate Archive for its reviewed compilation, source catalog, receipt, revision chain, or methodology.