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- W2160168644 abstract "Sufficient dimension reduction (SDR) techniques have proven to be very useful data analysis tools in various applications. Underlying many SDR techniques is a critical assumption that the predictors are elliptically contoured. When this assumption appears to be wrong, practitioners usually try variable transformation such that the transformed predictors become (nearly) normal. The transformation function is often chosen from the log and power transformation family, as suggested in the celebrated Box–Cox model. However, any parametric transformation can be too restrictive, causing the danger of model misspecification. We suggest a nonparametric variable transformation method after which the predictors become normal. To demonstrate the main idea, we combine this flexible transformation method with two well-established SDR techniques, sliced inverse regression (SIR) and inverse regression estimator (IRE). The resulting SDR techniques are referred to as TSIR and TIRE, respectively. Both simulation and real data results show that TSIR and TIRE have very competitive performance. Asymptotic theory is established to support the proposed method. The technical proofs are available as supplementary materials." @default.
- W2160168644 created "2016-06-24" @default.
- W2160168644 creator A5062736741 @default.
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- W2160168644 date "2015-01-02" @default.
- W2160168644 modified "2023-09-28" @default.
- W2160168644 title "Nonparametric Variable Transformation in Sufficient Dimension Reduction" @default.
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- W2160168644 doi "https://doi.org/10.1080/00401706.2014.901254" @default.
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