The total number of events required to be observed in a study to ensure a power of 1 − β of a test to detect the regression coefficient, β1, with a significance level α, according to Hsieh and Lavori (2000), is
The total number of events required to be observed in a study to ensure a power of 1 − β ofa test to detect the regression coefficient, β1, with a significance level α, according to Hsieh and Lavori (2000), is