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Uniform Appraisal Data The Uniform Appraisal Dataset (UAD) Aggregate Data includes summary statistics derived from aggregating UAD appraisal records. This dataset is derived from the UAD, which is a standardized industry dataset for appraisal information that is provided electronically to Fannie Mae and Freddie Mac (the Enterprises) through the Uniform Collateral Data Portal® (UCDP®). The UAD was first developed in 2010 by the Enterprises at the direction of FHFA. The UAD Aggregate Data File is intended for advanced users that utilize statistical software to extract and analyze data. The data contains variables categorizing appraisals by year or quarter, home characteristics, and geographic location, as well as appraisal statistics.