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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