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. Author manuscript; available in PMC: 2015 May 11.
Published in final edited form as: Biometrics. 2014 Aug 14;70(4):862–871. doi: 10.1111/biom.12209

Table 2.

Medians (interquartile ranges) of minimum model sizes required to retain the covariates in the second column. In Example 2, β0,5 is relevant only when τ = 0.5 and β0,55 is relevant only when τ = 0.25. Similarly, in Example 3 β0,5 is relevant only when τ = 0.5 and β0,25 is relevant only when τ = 0.25.

Covariates Wald Score Zhu et al. (2011) He et al. (2013)
Example 1
All 5699.5 (4231) 5500 (4091) 5645 (5022.25)
Example 2, τ = 0.5
All 6070.5 (4655.75) 6168.5 (3832.5) 5742 (4609.25) 9166 (2057)
β0,5 30.5 (62.75) 36.5 (94.25) 23 (28.25) 3451 (5856.5)
β0,55 2393 (4184.5) 1882.5 (5565.75) 547.5 (1028.25) 3708.5 (5094.5)
Example 2, τ = 0.25
All 5111 (4736.5) 5094 (4104.5) 5742 (4376) 9720 (554)
β0,5 1724.5 (4758.25) 1763 (5112.75) 23 (28.25) 5516.5 (5380.5)
β0,55 67.5 (309) 88.5 (273.5) 547.5 (1028.25) 2381 (6252.5)
Example 3, τ = 0.5
All 9620 (548.25) 9729 (337.75) 9277.5 (361.75) 9945 (243)
Example 4
All 5495.5 (4365.5) 5584.5 (4367.5) 5483 (4237.25)