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That's this research specifically only has 15 data points...not enough.
From the Doppler shift spectral line surveys they've done and the measurements of stellar metallicity of Sun-like stars they've taken, it appears only around 5% of all Sun-like stars have these large, close in gas giants* (hot Jupiters and the like). All those stars have higher metallicities than the Sun.
*(That's Saturn sized planets and larger within the equivalent orbit of Mercury about their parent stars.)
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