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. 2018 May 22;13:81. doi: 10.1186/s13023-018-0819-1

Table 3.

Percentage of cases experiencing extremely large variance due to perfect separation on probability scale (confidence interval for difference > 1)

Standard binary Augmented binary (GLS) Augmented binary (GEE)
N Unadjusted Adjusted Unadjusted Adjusted Unadjusted Adjusted
30 0.00 0.00 10.9 0.00 10.6 0.24
40 0.00 0.00 3.71 0.00 3.81 0.02
50 0.00 0.00 1.11 0.00 1.20 0.00
60 0.00 0.00 0.24 0.00 0.30 0.00
70 0.00 0.00 0.04 0.00 0.08 0.00
80 0.00 0.00 0.00 0.00 0.00 0.00