Fig. 3
From: Meta-analysis with zero-event studies: a comparative study with application to COVID-19 data
Comparison of the four methods with k=3, 6 or 12, τ2=0.25 or 1. “1” represents the results of the random-effects model with the Haldane estimator, “2” represents the results of the random-effects model with the TACC estimator, “3” represents the results of the random-effects model with the hybrid estimator, and “4” represents the results of the GLMM. TACC: Treatment arm continuity correction, GLMM: Generalized linear mixed model, MSE: Mean squared error