FIGURE 1.

Sample relative efficiencies (SREs) comparing ${\widehat{\xi }}_{\mathit{AIPW}}$ and ${\widehat{\xi }}_{\mathit{SRS}}$ to ${\widehat{\xi }}_{\mathit{IPW}}$ in terms of estimating γ₁, under various combinations of simple random sample (SRS) and supplemental samples. The SRE is defined as $SR{E}_{\mathit{AIPW}:\mathit{IPW}}=\mathit{var}\left({\widehat{\xi }}_{\mathit{IPW}}\right)/\mathit{var}\left({\widehat{\xi }}_{\mathit{AIPW}}\right)$. The X-axis is the fraction of SRS in the validation sample: n₀/n_V