Christian Rau.

Source: Brazilian Journal of Probability and Statistics, Volume 33, Number 3, 549--557.

Abstract:
We revisit a shape inversion formula derived by Panaretos in the context of a particle density estimation problem with unknown rotation of the particle. A distribution is presented which imitates, or “fakes”, the uniformity or Haar distribution that is part of that formula.

Emilia Athayde, Assis Azevedo, Michelli Barros, Víctor Leiva.

Source: Brazilian Journal of Probability and Statistics, Volume 33, Number 2, 301--328.

Abstract:
The Birnbaum–Saunders (BS) distribution has been largely studied and applied. A random variable with BS distribution is a transformation of another random variable with standard normal distribution. Generalized BS distributions are obtained when the normally distributed random variable is replaced by another symmetrically distributed random variable. This allows us to obtain a wide class of positively skewed models with lighter and heavier tails than the BS model. Its failure rate admits several shapes, including the unimodal case, with its change-point being able to be used for different purposes. For example, to establish the reduction in a dose, and then in the cost of the medical treatment. We analyze the failure rates of generalized BS distributions obtained by the logistic, normal and Student-t distributions, considering their shape and change-point, estimating them, evaluating their robustness, assessing their performance by simulations, and applying the results to real data from different areas.

Susheela P. Singh, Ana-Maria Staicu, Robert R. Dunn, Noah Fierer, Brian J. Reich.

Source: The Annals of Applied Statistics, Volume 13, Number 4, 2341--2362.

Abstract:
The advent of high-throughput sequencing technologies has made data from DNA material readily available, leading to a surge of microbiome-related research establishing links between markers of microbiome health and specific outcomes. However, to harness the power of microbial communities we must understand not only how they affect us, but also how they can be influenced to improve outcomes. This area has been dominated by methods that reduce community composition to summary metrics, which can fail to fully exploit the complexity of community data. Recently, methods have been developed to model the abundance of taxa in a community, but they can be computationally intensive and do not account for spatial effects underlying microbial settlement. These spatial effects are particularly relevant in the microbiome setting because we expect communities that are close together to be more similar than those that are far apart. In this paper, we propose a flexible Bayesian spike-and-slab variable selection model for presence-absence indicators that accounts for spatial dependence and cross-dependence between taxa while reducing dimensionality in both directions. We show by simulation that in the presence of spatial dependence, popular distance-based hypothesis testing methods fail to preserve their advertised size, and the proposed method improves variable selection. Finally, we present an application of our method to an indoor fungal community found within homes across the contiguous United States.

Ian L. Dryden, Kwang-Rae Kim, Charles A. Laughton, Huiling Le.

Source: The Annals of Applied Statistics, Volume 13, Number 4, 2213--2234.

Abstract:
Molecular dynamics simulations produce huge datasets of temporal sequences of molecules. It is of interest to summarize the shape evolution of the molecules in a succinct, low-dimensional representation. However, Euclidean techniques such as principal components analysis (PCA) can be problematic as the data may lie far from in a flat manifold. Principal nested spheres gives a fundamentally different decomposition of data from the usual Euclidean subspace based PCA [ Biometrika 99 (2012) 551–568]. Subspaces of successively lower dimension are fitted to the data in a backwards manner with the aim of retaining signal and dispensing with noise at each stage. We adapt the methodology to 3D subshape spaces and provide some practical fitting algorithms. The methodology is applied to cluster analysis of peptides, where different states of the molecules can be identified. Also, the temporal transitions between cluster states are explored.

Luis Gutiérrez, Eduardo Gutiérrez-Peña, Ramsés H. Mena.

Source: Bayesian Analysis, Volume 14, Number 2, 427--447.

Abstract:
This work presents a Bayesian predictive approach to statistical shape analysis. A modeling strategy that starts with a Gaussian distribution on the configuration space, and then removes the effects of location, rotation and scale, is studied. This boils down to an application of the projected normal distribution to model the configurations in the shape space, which together with certain identifiability constraints, facilitates parameter interpretation. Having better control over the parameters allows us to generalize the model to a regression setting where the effect of predictors on shapes can be considered. The methodology is illustrated and tested using both simulated scenarios and a real data set concerning eight anatomical landmarks on a sagittal plane of the corpus callosum in patients with autism and in a group of controls.

Gregorio Quintana-Ortí, Amelia Simó.

Source: Statistical Science, Volume 34, Number 2, 236--252.

Abstract:
This paper is focused on kernel regression when the response variable is the shape of a 3D object represented by a configuration matrix of landmarks. Regression methods on this shape space are not trivial because this space has a complex finite-dimensional Riemannian manifold structure (non-Euclidean). Papers about it are scarce in the literature, the majority of them are restricted to the case of a single explanatory variable, and many of them are based on the approximated tangent space. In this paper, there are several methodological innovations. The first one is the adaptation of the general method for kernel regression analysis in manifold-valued data to the three-dimensional case of Kendall’s shape space. The second one is its generalization to the multivariate case and the addressing of the curse-of-dimensionality problem. Finally, we propose bootstrap confidence intervals for prediction. A simulation study is carried out to check the goodness of the procedure, and a comparison with a current approach is performed. Then, it is applied to a 3D database obtained from an anthropometric survey of the Spanish child population with a potential application to online sales of children’s wear.

In 2011, declassified CIA documents shed light on a covert government program dating back to WWII

In its first year, the class attracted more than 1,200 students. The online version is abbreviated, but free

Universities, libraries and museums are among the organizations seeking personal stories about the pandemic's effects on daily life

The actor is one of 17 celebrities slated to participate in newly announced read-alongs of the series' first book

BIS Press Release - Shaping the future of payments: BIS Quarterly Review, 1 March 2020

The owner of P.E.I. Brewing Co., the oldest craft brewery on P.E.I., says the business went from preparing for its best year to its worst year.

Commentary on Red Book statistics: Shaping the future of payments, November 2019

The upcoming debate about whether to expand the urban boundary is one of the city's big issues this term. But instead of delaying it, the city's testing out a never-before-attempted democratic process. Should they?

Happy birthday Vijay Deverakonda: Tollywood's 'Dear Comrade' who auctioned his first Filmfare Award for charity  The New Indian Express

The mullahs are cold calculators.

Here's a look at what's happening in our area on Thursday, May 7.

Here's a look at what's happening in our area on Friday, May 8.

The post SOLIDWORKS Apps for Kids How-To: 3D Print a Shape It Creation appeared first on SOLIDWORKS Education Blog.

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Zanu PF's limited commitment to the Global Political Agreement (GPA) and the resultant institutionalisation of the Government of National Unity (GNU) is why the party began to push for elections as from 2010, a strategy seen as steering the total collapse of the agreement.

OM Guatemala distributes more than 1,000 pairs of shoes at local primary schools.

The world’s largest floating book fair welcomes its five millionth visitor as the tour of Asia comes to a conclusion.

Lauren Taylor catches up with the popular TV chef, after he explores the Med for his new show and cookbook.

THE SRU would be “very happy” to host the Scottish Cup semi-final between Heart of Midlothian and Hibernian at BT Murrayfield, the governing body’s Chief Operating Officer revealed yesterday.

Poland's Dolny Śląsk came from behind to beat hosts Bavaria 3-2 for the amateur title in a final of five penalties.

SOMETIMES, for a giggle, I like to imagine what Scotland would have been like had we kept the oil for ourselves. Like Saudi Arabia without the weather and executions, maybe? Or more like canny Norway, investing the cash in a big brolly for some future rainy day?

One teacher embraced the technique, with encouragement from a former district administrator. But he was told he had to reverse course, in part because of parent complaints.

Lorraine Wilson

Internet use has rapidly become a commonplace activity, especially among adolescents. Poor mental health and several somatic health problems are associated with heavy Internet use by adolescents.

Results of this study provide evidence of a U-shaped relationship between intensity of Internet use and poorer mental health of adolescents. Heavy Internet users were also confirmed to be at increased risk for somatic health problems in this nationally representative sample of adolescents. (Read the full article)

Preterm infants from 33 gestational weeks can detect specific shape features (prism and cylinder) by touch (without visual control), and remember them; however, nothing is known about such abilities earlier in development.

The preterm infant, even when very immature (from 28 gestational weeks), is endowed with tactile sensory abilities: the exploration and memorization of an object by touch, the discrimination of a novel object, and the recognition of a familiar object after interference. (Read the full article)

Three national educational funders explain a new program that is highlighting innovative practices in schools around the country.

Academic gender gaps in reading and math follow different paths as American students move from their school years into adulthood, according to new federal data.

For Norwegian international striker Ada Hegerberg, inspiring the next generation of women's players is a personal goal. In an interview which appears in the Women's U17 EURO tournament programme, we hear that the Olympique Lyonnais star wants budding young players to feel her same love of the game.

Effective immediately and for the foreseeable future, the Entrepreneurship and Assistance Clinic is expanding its scope and service offerings to small Pennsylvania businesses, in response to the COVID-19 pandemic.

A new high-res audio player looks like a wooden flask and has a tie-up with Tidal.

Student-teachers are grappling with uncertainty over housing, graduation requirements, and their ability to meet requirements for the edTPA licensing test.

The world is abandoning cash in favor of cashless payment systems, but Asia (not North America) is where the trend is growing the most.

Nurses act as caregiver, adviser, confidante, educator, advocate – often all at once – and for multiple patients. Nurses also shape policies at the national level as representatives of professional organizations. During National Nurses Week, we’re celebrating the important role nurses play, now and every day of the year.

Shoba Sivaprasad Wadhia, Samuel Weiss Faculty Scholar and Clinical Professor of Law at Penn State Law in University Park, has written a chapter on immigration law in a new legal textbook covering issues surrounding the current global COVID-19 pandemic, published by Columbia Law School.

Though much of the parent involvement research focuses on mothers, emerging studies show involved fathers can significantly improve their children's educational progress, too.