A Note on Identification of Match Fixed Effects as Interpretable Unobserved Match Affinity
将匹配固定效应识别为可解释的未观测匹配亲和度
We highlight that match fixed effects, represented by the coefficients of interaction terms involving dummy variables for two elements, lack identification without specific restrictions on parameters. Consequently, the coefficients typically reported as relative match fixed effects by statistical software are not interpretable. To address this, we establish normalization conditions that enable identification of match fixed effect parameters as interpretable indicators of…