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Table 1

Means and standard deviations of Cox estimates of ddhz by sample size

Treatment at Calendar Time 60 MonthsTreatment at Calendar Time 90 Months
MeanSDnMeanSDn
0.10053 0.07082 5,000 0.10520 0.05503 5,000 
0.09944 0.04310 10,000 0.10486 0.04064 10,000 
0.10061 0.03242 20,000 0.10471 0.02771 20,000 
Treatment at Calendar Time 60 MonthsTreatment at Calendar Time 90 Months
MeanSDnMeanSDn
0.10053 0.07082 5,000 0.10520 0.05503 5,000 
0.09944 0.04310 10,000 0.10486 0.04064 10,000 
0.10061 0.03242 20,000 0.10471 0.02771 20,000 

Note: The simulated data were generated according to the proportional hazard DD in Eq. (3), with the baseline hazard r0(u) set equal to a constant λ=0.008; the regression coefficients b1, b2, and ddhz are assumed equal and set to 0.10; the start of observation, τ1, is set to 24 months; and τ, the start of treatment, is set at 60 or 90 months.

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