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. 2013 Oct;10(5):807–827. doi: 10.1177/1740774513497293

Arm dropping

Probability arm dropped (at least once)
Arm 1 Arm 2 Arm 3
Null 0.51 0.48 0.51
Alternative 0.51 0.51 0.50
One Works 0.75 0.73 0.20
Middle 0.78 0.55 0.28
Worse 0.48 0.47 0.45