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Table 1 Results for the reference configuration

From: On the use of propensity scores in case of rare exposure

Method y n Bias V ratio RMSE 1-coverage % match
PSW-ATE 10 364 0.056 0.914 0.406 0.091  
  20 728 0.028 0.982 0.271 0.065  
  30 1092 0.018 1.009 0.216 0.057  
PSW-ATT 10 364 0.026 0.983 0.321 0.060  
  20 728 0.013 1.019 0.222 0.047  
  30 1092 0.008 1.031 0.180 0.046  
PS-matching 10 364 0.051 0.925 0.473 0.062 99.0
  20 728 0.026 0.964 0.316 0.056 99.5
  30 1092 0.017 0.990 0.250 0.053 99.7
  1. Bias, variability ratio, RMSE, and 1-coverage according to analytical method, number of events in the exposed group y, and mean analyzed sample size n, for one scenario (p=5 %, σ U,B =σ U,C =0.3, σ B,C =0, \(\exp (\delta _{B}) = \exp (\delta _{C}) = 1.5\), H R=1, 2 confounding factors, censoring rate r c =50 %). The mean percentage of matched exposed subjects is reported for the PS-matching method