Table 2.

Results of three methods of estimating b _HE (the effect of higher education on IQ) and b _start (the contribution of IQ at the start of higher education to adult IQ) in real data.

assumed	covariate method		error-in-variables		iterated simulations
value of ρ	b HE	b start	b HE	b start	b HE	b start
0.82	0.86 [0.76, 0.97]	0.47 [0.44, 0.50]	0.27 [0.11, 0.42]	0.64 [0.60, 0.68]	0.32 [0.16, 0.48]	0.65 [0.61, 0.69]
0.84	0.86 [0.76, 0.97]	0.47 [0.44, 0.50]	0.36 [0.22, 0.50]	0.62 [0.57, 0.66]	0.42 [0.27, 0.57]	0.62 [0.59, 0.66]
0.86	0.86 [0.76, 0.97]	0.47 [0.44, 0.50]	0.44 [0.31, 0.58]	0.59 [0.55, 0.63]	0.51 [0.37, 0.65]	0.60 [0.56, 0.64]

Notes: Estimates with 95% CIs based on 1000 bootstrap samples.