München [Munich] : Jos. Albert K.B. Hof-Photograph, [1860]

Paris ; Londres ; La Haye : Imprimé & publié par Boussod, Valadon & Cie, éditeurs successeurs de Goupil & Cie ; Berlin : Verlag von Boussod, Valadon & Co. ; New-York : Published by M. Knoedler & Co., Le 1er Juin 1886.

[1856]

London (6, Pall Mall) : Published ... by Henry Graves, & Comp.y, May 10th, 1856.

[19--?]

[Manchester] : [James Mudd], [between 1800 and 1899]

[Manchester] : [James Mudd], [between 1800 and 1899]

[19--?]

[19--?]

[19--?]

[19--?]

(Printed in Austria)

London : Printed and sold by Thos. and John Bowles, printsellers, [1728]

There have been so many great hockey images taken by photographers. We choose our top three shots ranging from Stanley Cup celebations to iconic moments.

A few nights after one of their players was injured by a dirty hit, the Johnstown Jets plotted to exact some revenge on Buffalo's Greg Neeld. An all-out brawl broke out during warmups and the North American Hockey League game was postponed, much to the dismay of ownership and presumably the fans at a sold-out War Memorial Arena. It just so happened that director George Roy Hill was in the arena that night, cameras rolling.

In many areas, practitioners need to analyze large data sets that challenge conventional single-machine computing. To scale up data analysis, distributed and parallel computing approaches are increasingly needed. Here we study a fundamental and highly important problem in this area: How to do ridge regression in a distributed computing environment? Ridge regression is an extremely popular method for supervised learning, and has several optimality properties, thus it is important to study. We study one-shot methods that construct weighted combinations of ridge regression estimators computed on each machine. By analyzing the mean squared error in a high-dimensional random-effects model where each predictor has a small effect, we discover several new phenomena. Infinite-worker limit: The distributed estimator works well for very large numbers of machines, a phenomenon we call 'infinite-worker limit'. Optimal weights: The optimal weights for combining local estimators sum to more than unity, due to the downward bias of ridge. Thus, all averaging methods are suboptimal. We also propose a new Weighted ONe-shot DistributEd Ridge regression algorithm (WONDER). We test WONDER in simulation studies and using the Million Song Dataset as an example. There it can save at least 100x in computation time, while nearly preserving test accuracy.

Flávio B. Gonçalves, Bárbara C. C. Dias.

Source: Brazilian Journal of Probability and Statistics, Volume 33, Number 4, 782--800.

Abstract:
Educational assessment usually considers a contextual questionnaire to extract relevant information from the applicants. This may include items related to socio-economical profile as well as items to extract other characteristics potentially related to applicant’s performance in the test. A careful analysis of the questionnaires jointly with the test’s results may evidence important relations between profiles and test performance. The most coherent way to perform this task in a statistical context is to use the information from the questionnaire to help explain the variability of the abilities in a joint model-based approach. Nevertheless, the responses to the questionnaire typically present missing values which, in some cases, may be missing not at random. This paper proposes a statistical methodology to model the abilities in dichotomous IRT models using the information of the contextual questionnaires via linear regression. The proposed methodology models the missing data jointly with the all the observed data, which allows for the estimation of the former. The missing data modelling is flexible enough to allow the specification of missing not at random structures. Furthermore, even if those structures are not assumed a priori, they can be estimated from the posterior results when assuming missing (completely) at random structures a priori. Statistical inference is performed under the Bayesian paradigm via an efficient MCMC algorithm. Simulated and real examples are presented to investigate the efficiency and applicability of the proposed methodology.

Lekha Patel, Nils Gustafsson, Yu Lin, Raimund Ober, Ricardo Henriques, Edward Cohen.

Source: The Annals of Applied Statistics, Volume 13, Number 3, 1397--1429.

Abstract:
Fluorescing molecules (fluorophores) that stochastically switch between photon-emitting and dark states underpin some of the most celebrated advancements in super-resolution microscopy. While this stochastic behavior has been heavily exploited, full characterization of the underlying models can potentially drive forward further imaging methodologies. Under the assumption that fluorophores move between fluorescing and dark states as continuous time Markov processes, the goal is to use a sequence of images to select a model and estimate the transition rates. We use a hidden Markov model to relate the observed discrete time signal to the hidden continuous time process. With imaging involving several repeat exposures of the fluorophore, we show the observed signal depends on both the current and past states of the hidden process, producing emission probabilities that depend on the transition rate parameters to be estimated. To tackle this unusual coupling of the transition and emission probabilities, we conceive transmission (transition-emission) matrices that capture all dependencies of the model. We provide a scheme of computing these matrices and adapt the forward-backward algorithm to compute a likelihood which is readily optimized to provide rate estimates. When confronted with several model proposals, combining this procedure with the Bayesian Information Criterion provides accurate model selection.

Indian authorities used drones and fire engines to disinfect the pandemic-hit city of Ahmedabad on Saturday, as virus cases surged and police clashed with migrant workers protesting against a reinforced lockdown. The western city of 5.5 million people in Prime Minister Narendra Modi's home state has become a major concern for authorities as they battle an uptick in coronavirus deaths and cases across India.

1897.

[London], 2019.

02020-02-02: Sea Ice in the Sea of Okhotsk

These parks are less popular, but no less spectacular

Winds on WASP-76b blow gaseous iron into cooler regions, where it condenses and falls to the planet’s surface as liquid

As monarchs leave their winter hideaways, conservationists are seeking assistance in studying their migration routes

Closed due to COVID-19, the Museum Hotel Antakya looks forward to welcoming guests with its blend of luxury and history once restrictions are lifted

How do you select one image to represent half a century of photography and art? You don’t

Through their images, these artists combat the stereotypes perpetuated by American history and culture

Venturing into the wilderness for often weeks at a time, nature photographer Dawn LaPointe is used to social distancing

From Vietnam to Antarctica, this year's winners bring you amazing glimpses of a changing world—and the indefatigable human spirit

The new book 'The Rainbow Atlas' invites readers on a vivid journey across the globe

Ontario's police watchdog says an OPP officer didn't break the law when he shot and killed a man running at him with an aluminum bat in November 2019.

The National Capital Commission has reversed its decision and will now allow passersby to take photos at this year's Canadian Tulip Festival.

The National Capital Commission (NCC) says tulip admirers can "feel free" to take photos of the colourful flowers while visiting the Canadian Tulip Festival after placing signs saying photography wasn't allowed in tulip beds earlier this week.

For all the sporting moments Mark Blinch has captured through his lens for nearly two decades, there is only one he has taken the trouble to hang in his home.

Grit and red wine: Famous war photographer beats virus at 97  WSET

With ‘Four More Shots Please!,’ India Gets Its Own ‘Sex and the City’  The New York Times

See the Full Flower Moon, last supermoon of 2020, bloom in these stunning photos  Space.comIn Pictures: 'Full-flower supermoon' amid coronavirus lockdowns  Aljazeera.comIn pics | Last supermoon in 2020: Stunning views from around th...

Twenty-five years after meeting Johnny Cash, a Newfoundland musician is trying to track down a photo of the pair.

Matteo Tranchellini and Moreno Monti created a coffee table book called CHICken to showcase the natural beauty of the ubiquitous birds.

While players are stuck in self isolation, they don’t need to worry about trying to stop Alexander Ovechkin’s “knuckleball” type shot.

Just when you thought you watched the best shot of the Brier, another best shot of the Brier appears at the 2020 Canadian men's curling championship being held in Kingston, Ont.