Fan et al. (Ann Stat 47(6):3009–3031, 2019) constructed a distributed principal component analysis (PCA) algorithm to reduce the communication cost between multiple servers significantly. However, their algorithm’s guarantee is only for sub-Gaussian data. Spurred by this deficiency, paper enhances effectiveness of PCA utilizing robust covariance matrix estimators Minsker 46(6A):2871–2903, 2018)...

The recent discovery of rotating radio transients and the quasi-periodicity of pulsar activity in the radio pulsar PSR B1931+24 has challenged the conventional theory of radio pulsar emission. Here we suggest that these phenomena could be due to the interaction between the neutron star magnetosphere and the surrounding debris disk. The pattern of pulsar emission depends on whether the disk can ...

The magnitude of crustal extension across the northern Basin and Range province is a matter of longstanding controversy; estimates range from 10 to 3009~,. Recently published estimates of extension across the southern Basin and Range province (36°N) are in the range of 80-100%. Thus, the larger values suggested for the northern part of the province (40°N) seem to require substantial countercloc...

Michael Neumann t Department of Mathematics University of Connecticut . Storrs, CT 06269-3009. Because the spectral radius is only an asymptotic measure of the rate of convergence of a linear iterative method, Golub and dePillis have raised in a recent paper the question of determining, for each k ~ 1, a relaxation parameter w E (0,2) and a pair of relaxation parameters WI and W2 which minimize...

Ubiquitination, the covalent binding of the small protein modifier ubiquitin to a target protein, is an important and frequently studied posttranslational protein modification. Multiple reports provide useful insights into the plant ubiquitinome, but mostly at the protein level without comprehensive site identification. Here, we implemented ubiquitin combined fractional diagonal chromatography ...

INTRODUCTION We develop a multidomain model to predict progression of Alzheimer's disease dementia (AD). METHODS Data from the US National Alzheimer's Coordinating Center (n = 3009) are used to examine change in symptom status and to estimate transition probabilities between health states described using cognitive function, functional ability, and behavior. A model is used to predict progress...

Recently, an alternative approach to self-diffusion in atomic liquids was proposed by one of us [Vergeles, M.; Szamel, G. Chem. Phys. 1999, 110, 3009]. This approach is applicable where the concept of binary collisions breaks down and the self-diffusion coefficient is small. Predictions from this method are in quantitative agreement with molecular dynamics (MD) simulations, over a broad range o...

A large portion of the variation in wages and wage growth rates among individuals is due to "unobserved" heterogeneity, and the source of individual heterogeneity is typically attributed to data limitations and/or the unobservability of certain productivity related factors. In this paper we develop a test that discriminates between two inherently unobservable sources of heterogeneity (both of w...

We explore the extent to which schools manipulate the composition of students in the test-taking pool in order to maximize ratings under Texas' accountability system in the 1990s. We first derive predictions from a static model of administrators' incentives given the structure of the ratings criteria, and then test these predictions by comparing differential changes in exemption rates across st...