A reference-guided, tuning-free estimator asymptotically reduces all principal angles to the true PC subspace when reference information is full-rank, and is exactly a James-Stein shrinkage estimator.
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Adaptive Reference-Guided Estimation of Principal Component Subspace in High Dimensions
A reference-guided, tuning-free estimator asymptotically reduces all principal angles to the true PC subspace when reference information is full-rank, and is exactly a James-Stein shrinkage estimator.