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We discuss results on the fraction of QSOs with BALs in various subsamples of QSOs. The subsamples are defined by considering radio, IR, optical, UV, and emission-line properties. The fraction of QSOs with BALs is highly dependent on the properties of the subsample. These results have model-dependent implications for the range of sizes of the BAL region covering factors, the large-scale BAL region geometry, and models for anisotropic continuum and line emission in QSOs.
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