We propose a new, computationally efficient way to approximate the “grouped fixed effects” (GFE) estimator of Bonhomme and Manresa (2015), which estimates grouped patterns unobserved heterogeneity. To do so, we generalize fuzzy C-means objective regression settings. As clustering exponent m $$ approaches 1, converges GFE objective, recast as standard generalized method moments problem. replicat...

The study examined intellectual domains of meta-analysis used in SLA research based on Chinese core journals and English peer-reviewed from 2000 to 2022. Two datasets were created via CSSCI Web Science (WoS): 1) a dataset Linguistic educational comprising 50 articles, 2) WoS 167 articles published the reputed within registers Linguistics research. It employed document co-citation analysis (DCA)...