Results 51 to 60 of about 246,485 (302)

Anchor Selection Using the Wald Test Anchor-All-Test-All Procedure [PDF]

Applied Psychological Measurement, 2016
Methods for testing differential item functioning (DIF) require that the reference and focal groups are linked on a common scale using group-invariant anchor items. Several anchor-selection strategies have been introduced in an item response theory framework. However, popular strategies often utilize likelihood ratio testing with all-others-as-anchors
Mian, Wang, Carol M, Woods
openaire   +2 more sources

Dynamics of the Mammalian Placental Metabolome in Placentogenesis and Embryonic Development

Advanced Science, EarlyView.
This study identifies three metabolic stages (E8.5, E9.5–10.5, E11.5–14.5) and two transition periods (E8.5–9.5, E10.5–11.5) in mouse placental development. NAD(H) emerges as a key dynamic metabolite that enhances embryonic growth through accelerated segmentation and increased proliferation of mouse embryonic stem cell (mESC)‐induced presomitic ...
Gang Chen, Zichen Liu, Mengyi Wei, Qian Li, Liang Wu, Kunyuan Yu, Yanhong Xu, Dainan Yu, Wenwu Ma, Hongmei Wang, Ng Shyh‐Chang, Jinglei Zhai   +11 more
wiley   +1 more source

A MULTIVARIATE WALD-WOLFOWITZ RANK TEST AGAINST SERIAL DEPENDENCE [PDF]

The Canadian Journal of Statistics / La Revue Canadienne de Statistique, 1995
Summary: Rank-based cross-covariance matrices, extending to the case of multivariate observed series the (univariate) rank autocorrelation coefficients introduced by \textit{A. Wald} and \textit{J. Wolfowitz} [Ann. Math. Stat. 14, 378-388 (1943; Zbl 0060.302)], are considered.
Hallin, Marc, Puri, Madan L.
openaire   +1 more source

Gut Microbiota‐Derived Anandamide Mediates the Therapeutic Effects of Urolithin A on Alcohol‐Induced Cognitive and Social Dysfunction via CB1R‐DRD2‐RAP1 Signaling Axis

Advanced Science, EarlyView.
This study reveals that Urolithin A (UA) counteracts alcohol‐induced cognitive and social dysfunction (AICSD) via a gut microbiome‐dependent mechanism. UA‐enriched Bacteroids sartorii and Parabacteroids distasonis elevate anandamide (AEA), which activates the CB1R‐DRD2‐Rap1 signaling cascade to drive synaptic repair and reduce neuroinflammation ...
Hongbo Zhang, Zibin Li, Yao Xiao, Ji Bian, Caian He, Chao Liu, Lan Gong, Lin Han, Zhigang Liu, Min Wang   +9 more
wiley   +1 more source

Does stock market-based financial development promotes economic growth in emerging markets? New evidence from Nigeria

Serbian Journal of Management, 2020
This study examines the effect of stock market development on economic growth in Nigeria. The study spans the period 1980-2016. It employs the ARDL approach to cointegration.
Solomon Prince Nathaniel, Joseph Ayoola Omojolaibi, Chikaodili Josephine Ezeh   +2 more
doaj   +1 more source

On the Formulation of Wald Tests of Nonlinear Restrictions [PDF]

Econometrica, 1988
Summary: This paper utilizes asymptotic expansions of the Edgeworth type to investigate alternative forms of the Wald test of nonlinear restrictions. Some formulae for the asymptotic expansion of the distribution of the Wald statistic are provided for a general case that should include most econometric applications. When specialized to the simple cases
Phillips, Peter C B, Park, Joon Y
openaire   +2 more sources

On Hodges and Lehmann's "$6/\pi$ result" [PDF]

, 2013
While the asymptotic relative efficiency (ARE) of Wilcoxon rank-based tests for location and regression with respect to their parametric Student competitors can be arbitrarily large, Hodges and Lehmann (1961) have shown that the ARE of the same Wilcoxon ...
Hallin, Marc, Swan, Yvik, Verdebout, Thomas   +2 more
core   +1 more source

Engineered Living Systems With Self‐Organizing Neural Networks: From Anatomy to Behavior and Gene Expression

Advanced Science, EarlyView.
Ectodermal tissue excised from Xenopus embryos self‐organizes into a three‐dimensional mucociliary organoid. Here, we generate a neural variant, termed neurobot, by implanting neural precursor cells. Neurobots develop mature neurons, adopt distinct morphologies, exhibit more complex motility, and respond differentially to neuroactive compounds. Imaging
Haleh Fotowat, Laurie O'Neill, Léo Pio‐Lopez, Megan M. Sperry, Patrick Erickson, Tiffany Lin, Michael Levin   +6 more
wiley   +1 more source

Divergent Responses of Bacterial Communities to Permafrost Degradation and Their Associations With Carbon Across Vertical Profiles

Advanced Science, EarlyView.
Bacterial α‐diversity decreases, but stochasticity and community stability increase across the 15 m‐depth vertical profiles and along the degraded gradient within the active layer. The abundance and interaction of core taxa mainly control community stability in the active and permafrost layers, respectively.
Shengyun Chen, Yuzheng Gu, Ali Bahadur, Enyan Liu, Tonghua Wu, Xiaofan Zhu, Yuanqiang Zou, Hewei Liang, Peijie Wei, Linwei Wu, Qingbai Wu, Peizhi Yang, Hongyan Yu, Yunfeng Yang   +13 more
wiley   +1 more source

Testing for Causality in Variance using Multivariate GARCH Models [PDF]

Tests of causality in variance in multiple time series have been proposed recently, based on residuals of estimated univariate models. Although such tests are applied frequently little is known about their power properties.
Hafner, Christian M., Herwartz, Helmut
core   +3 more sources