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作者：Shi, Xu; Li, Xiaoou; Cai, Tianxi
作者单位：University of Michigan System; University of Michigan; University of Minnesota System; University of Minnesota Twin Cities; Harvard University
摘要：Motivated by a series of applications in data integration, language translation, bioinformatics, and computer vision, we consider spherical regression with two sets of unit-length vectors when the data are corrupted by a small fraction of mismatch in the response-predictor pairs. We propose a three-step algorithm in which we initialize the parameters by solving an orthogonal Procrustes problem to estimate a translation matrix ignoring the mismatch. We then estimate a mapping matrix aiming to c...
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作者：Abadie, Alberto; L'Hour, Jeremy
作者单位：Massachusetts Institute of Technology (MIT); National Bureau of Economic Research; Institut Polytechnique de Paris; ENSAE Paris
摘要：Synthetic control methods are commonly applied in empirical research to estimate the effects of treatments or interventions on aggregate outcomes. A synthetic control estimator compares the outcome of a treated unit to the outcome of a weighted average of untreated units that best resembles the characteristics of the treated unit before the intervention. When disaggregated data are available, constructing separate synthetic controls for each treated unit may help avoid interpolation biases. Ho...
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作者：Fogarty, Colin B.; Lee, Kwonsang; Kelz, Rachel R.; Keele, Luke J.
作者单位：Massachusetts Institute of Technology (MIT); Sungkyunkwan University (SKKU); University of Pennsylvania; University of Pennsylvania
摘要：We investigate the efficacy of surgical versus nonsurgical management for two gastrointestinal conditions, colitis and diverticulitis, using observational data. We deploy an instrumental variable design with surgeons' tendencies to operate as an instrument. Assuming instrument validity, we find that nonsurgical alternatives can reduce both hospital length of stay and the risk of complications, with estimated effects larger for septic patients than for nonseptic patients. The validity of our in...
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作者：Chatterjee, Sourav
作者单位：Stanford University
摘要：Is it possible to define a coefficient of correlation which is (a) as simple as the classical coefficients like Pearson's correlation or Spearman's correlation, and yet (b) consistently estimates some simple and interpretable measure of the degree of dependence between the variables, which is 0 if and only if the variables are independent and 1 if and only if one is a measurable function of the other, and (c) has a simple asymptotic theory under the hypothesis of independence, like the classic...
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作者：Datta, Jyotishka; Mukherjee, Bhramar
作者单位：Virginia Polytechnic Institute & State University; University of Michigan System; University of Michigan
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作者：Zhou, Fan; Luo, Shikai; Qie, Xiaohu; Ye, Jieping; Zhu, Hongtu
作者单位：Shanghai University of Finance & Economics
摘要：How to dynamically measure the local-to-global spatio-temporal coherence between demand and supply networks is a fundamental task for ride-sourcing platforms, such as DiDi. Such coherence measurement is critically important for the quantification of the market efficiency and the comparison of different platform policies, such as dispatching. The aim of this paper is to introduce a graph-based equilibrium metric (GEM) to quantify the distance between demand and supply networks based on a weight...
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作者：Li, Yutong; Zhu, Ruoqing; Qu, Annie; Ye, Han; Sun, Zhankun
作者单位：University of Illinois System; University of Illinois Urbana-Champaign; University of California System; University of California Irvine; University of Illinois System; University of Illinois Urbana-Champaign; City University of Hong Kong
摘要：Emergency department (ED) crowding is a universal health issue that affects the efficiency of hospital management and patient care quality. ED crowding frequently occurs when a request for a ward-bed for a patient is delayed until a doctor makes an admission decision. In this case study, we build a classifier to predict the disposition of patients using manually typed nurse notes collected during triage as provided by the Alberta Medical Center. These predictions can potentially be incorporate...
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作者：Cattaneo, Matias D.; Feng, Yingjie; Titiunik, Rocio
作者单位：Princeton University; Tsinghua University; Princeton University
摘要：Uncertainty quantification is a fundamental problem in the analysis and interpretation of synthetic control (SC) methods. We develop conditional prediction intervals in the SC framework, and provide conditions under which these intervals offer finite-sample probability guarantees. Our method allows for covariate adjustment and nonstationary data. The construction begins by noting that the statistical uncertainty of the SC prediction is governed by two distinct sources of randomness: one coming...
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作者：Kang, Sangwook
作者单位：Yonsei University
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作者：Quick, Corbin; Dey, Rounak; Lin, Xihong
作者单位：Harvard University; Harvard T.H. Chan School of Public Health; Harvard University
摘要：Modeling infectious disease dynamics has been critical throughout the COVID-19 pandemic. Of particular interest are the incidence, prevalence, and effective reproductive number (R-t). Estimating these quantities is challenging due to under-ascertainment, unreliable reporting, and time lags between infection, onset, and testing. We propose a Multilevel Epidemic Regression Model to Account for Incomplete Data (MERMAID) to jointly estimate R-t, ascertainment rates, incidence, and prevalence over ...
