For this case study, we use a survey conducted by the Association of American Universities (AAU) in April 2022. This survey ran in parallel on (1) a nonprobability sample obtained from an opt-in Web sample vendor and (2) the SSRS Opinion Panel Omnibus, a bimonthly, multi-client probability sample. These samples were combined to create a hybrid sample. The hybrid sample was initially calibrated using SSRS’s original Encipher Hybrid methodology.

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