. Author manuscript; available in PMC: 2020 May 9.

Published in final edited form as: Biometrika. 2014 May 16;101(3):519–533. doi: 10.1093/biomet/asu005

Table 2.

Association estimations of τ_XY for HIV seroconversion data

Cohort	Group size	${\hat{τ}}_{X Y}^{n}$	${SE}_{b} ({\hat{τ}}_{X Y}^{n})$	$CI ({\hat{τ}}_{X Y}^{n})$	${\hat{τ}}_{X Y}^{s}$	${SE}_{b} ({\hat{τ}}_{X Y}^{s})$	$CI ({\hat{τ}}_{X Y}^{s})$
All	837	−0·018	0·047	(−0·110, 0·074)	−0·022	0·053	(−0·126, 0·082)
A	64	0·297	0·156	(−0·011, 0·603)	0·303	0·153	(−0·063, 0·538)
Non-A	349	−0·038	0·057	(−0·150, 0·074)	−0·041	0·071	(−0·179, 0·101)
Unknown	424	−0·034	0·040	(−0·112, 0·044)	−0·039	0·046	(−0·129, 0·053)

${\hat{τ}}_{X Y}^{n}$ , nonparametric estimator; ${\hat{τ}}_{X Y}^{s}$ , copula model-based semiparametric estimator; SE_b, bootstrap standard error; CI, 95% confidence interval.