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2,221 results on '"Hu, Xiaoyu"'

255. A Two-Sample Conditional Distribution Test Using Conformal Prediction and Weighted Rank Sum

Author

Hu, Xiaoyu and Lei, Jing

Subjects
Methodology (stat.ME), FOS: Computer and information sciences, Statistics and Probability, Statistics, Probability and Uncertainty, Statistics - Methodology
Abstract

We consider the problem of testing the equality of conditional distributions of a response variable given a vector of covariates between two populations. Such a hypothesis testing problem can be motivated from various machine learning and statistical inference scenarios, including transfer learning and causal predictive inference. We develop a nonparametric test procedure inspired from the conformal prediction framework. The construction of our test statistic combines recent developments in conformal prediction with a novel choice of conformity score, resulting in a weighted rank-sum test statistic that is valid and powerful under general settings. To our knowledge, this is the first successful attempt of using conformal prediction for testing statistical hypotheses beyond exchangeability. Our method is suitable for modern machine learning scenarios where the data has high dimensionality and large sample sizes, and can be effectively combined with existing classification algorithms to find good conformity score functions. The performance of the proposed method is demonstrated in various numerical examples., 46 pages, 2 figures, 7 tables; to appear in Journal of the American Statistical Association

Published
2023

285. What Controls the Subseasonal Precipitation Reversal Over the Western Tibetan Plateau in Winter?

Author

Liu, Yong, Li, Xiangyu, Zhang, Zhongshi, Li, Hua, Chen, Huopo, and Hu, Xiaoyu

Subjects
OCEAN temperature, PRECIPITATION anomalies, TIBETANS, EDDY flux, WESTERLIES, CYCLONES
Abstract

This study reveals a significant subseasonal reversal of precipitation on the western Tibetan Plateau (WTP) from a deficit in December to an increase in January and February (JF). Changes in vertical moisture advection induced by the dynamic effects contribute mostly to the subseasonal precipitation trend reversal. This process involves the reversal of the subseasonal westerly driven uplift, accompanied by the weakened (enhanced) subtropical westerly jet and anticyclonic (cyclonic) anomalies over the WTP in December (JF). Further analysis shows that the North Atlantic Tripolar‐like (NAT) sea surface temperature (SST) modes could regulate the sunseasonal winter precipitation reversal over the WTP. The spatially inconsistent changes in SST can result in subseasonal reversed turbulent heat flux anomalies over Iceland‐Scandinavia in December and JF. In particular, the suppressed turbulent heat flux over the extratropical Northeast Atlantic in December leads to significant descending motion and upper tropospheric convergence. The advection of absolute vorticity induced by convergent winds associated with the NAT favors the generation of Rossby wave sources over Iceland‐Scandinavia, which then enhances the wave activity fluxes propagation. However, there are no significant changes in wave sources over Iceland‐Scandinavia in JF. The discrepancies in wave propagation intensity over Iceland‐Scandinavia determine the changes in the atmospheric pattern over the WTP, with anomalous anticyclone in December and cyclone in JF, and ultimately lead to the precipitation reversal. Furthermore, our results show that the suppressed transient eddies over the Atlantic storm track in JF may also contribute to the weakened wave propagation over Iceland‐Scandinavia. Key Points: A subseasonal reversal of precipitation in winter is evident in precipitation anomalies over the western Tibetan PlateauThe main contributor to the precipitation reversal is the subseasonal reversal of vertical moisture advection due to dynamic effectsThe Atlantic tripolar sea surface temperature anomalies could regulate precipitation reversal through stimulating asymmetric circulation mode over Eurasia [ABSTRACT FROM AUTHOR]

Published
2023
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294. Supplementary Figures and Tables from NOTCH1 Signaling Regulates Self-Renewal and Platinum Chemoresistance of Cancer Stem–like Cells in Human Non–Small Cell Lung Cancer

Author

Zhang, Yun, primary, Xu, Wei, primary, Guo, Huiqin, primary, Zhang, Yanmei, primary, He, Yuexi, primary, Lee, Sau Har, primary, Song, Xin, primary, Li, Xiaoyan, primary, Guo, Yongqing, primary, Zhao, Yunlong, primary, Ding, Cheng, primary, Ning, Fei, primary, Ma, Yuanyuan, primary, Lei, Qun-Ying, primary, Hu, Xiaoyu, primary, Li, Shengnan, primary, and Guo, Wei, primary

Published
2023
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295. Supplementary Methods from NOTCH1 Signaling Regulates Self-Renewal and Platinum Chemoresistance of Cancer Stem–like Cells in Human Non–Small Cell Lung Cancer

Author

Zhang, Yun, primary, Xu, Wei, primary, Guo, Huiqin, primary, Zhang, Yanmei, primary, He, Yuexi, primary, Lee, Sau Har, primary, Song, Xin, primary, Li, Xiaoyan, primary, Guo, Yongqing, primary, Zhao, Yunlong, primary, Ding, Cheng, primary, Ning, Fei, primary, Ma, Yuanyuan, primary, Lei, Qun-Ying, primary, Hu, Xiaoyu, primary, Li, Shengnan, primary, and Guo, Wei, primary

Published
2023
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296. Data from NOTCH1 Signaling Regulates Self-Renewal and Platinum Chemoresistance of Cancer Stem–like Cells in Human Non–Small Cell Lung Cancer

Author

Zhang, Yun, primary, Xu, Wei, primary, Guo, Huiqin, primary, Zhang, Yanmei, primary, He, Yuexi, primary, Lee, Sau Har, primary, Song, Xin, primary, Li, Xiaoyan, primary, Guo, Yongqing, primary, Zhao, Yunlong, primary, Ding, Cheng, primary, Ning, Fei, primary, Ma, Yuanyuan, primary, Lei, Qun-Ying, primary, Hu, Xiaoyu, primary, Li, Shengnan, primary, and Guo, Wei, primary

Published
2023
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