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128 results for “skew”

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zenodo44/100

Terahertz Spin-to-Charge Conversion by Interfacial Skew Scattering in Metallic Bilayers

Data of the publication "Terahertz Spin-to-Charge Conversion by Interfacial Skew Scattering in Metallic Bilayers" published in Advanced Materials, 33, 2006281 (2021). THz waveforms for a subset and RMS data - corrected for pump incoupling and THz outcoupling - for various F and N metallic bilayers and interface modifications as well as the calculated spin Hall angles for different interfacial impurities are provided.

opencc-by-4.0Jan 2021View details →

zenodo40/100

Skew Surges

Supplementary data set of the paper: Marcos, M. and Woodworth, P.L. 2017. Spatio-temporal changes in extreme sea levels along the coasts of the North Atlantic and the Gulf of Mexico. Journal of Geophysical Research Oceans, 122, doi:10.1002/2017JC013065. The file contains the skew surges computed for all tide gauge records in GESLA2 data base, as described in the above publication.

opencc-by-4.0Sep 2022View details →

zenodo40/100

Forecasting the CBOE VIX and SKEW Indices Using Heterogeneous Autoregressive Models

This dataset is used in the paper "Forecasting the CBOE VIX and SKEW Indices Using Heterogeneous Autoregressive Models" by Massimo Guidolin and Giulia F. Panzeri. The data contains daily observations of the VIX, SKEW, and SKEW− indices over the period January 4, 1996, - December 31, 2019. This period covers a total of 6,005 daily observations. The dataset is constructed from multiple sources as described in the paper and includes several files that correspond to different transformations and forecast errors of the indices.

opencc-by-4.0Sep 2024View details →

zenodo40/100

GC Skew and origin of replication-related plots for all Archaea genomes.

We generated data and plots exhaustively for all Archaea complete genomes in the <a href="https://www.ncbi.nlm.nih.gov/datasets/genomes/?taxon=2157">NCBI dataset </a>in April 2022. Plots and data available: SkewI and GC Skew: <ul> <li>  SkewI and  GC content of every archaeon complete genome. </li> <li> Cumulative GC Skew plot of every complete genome, with an estimation of the origin and termination point in the sequence, obtained by analyzing the plot </li> <li> The same results are available sorted by taxonomy (Euryarchaeota, Crenarchaeota, Thaumarchaeota) and SkewI values. </li> </ul>   Dot Plots: <ul> <li> Dot plots comparing two by two each of the ten genomes having the highest SkewI value for any given taxonomy. An estimation of the origin of replication based on the cumulative GC Skew is represented. </li> <li> Dot plots comparing two by two a genome of high SkewI with a genome of low SkewI. </li> </ul>   Clinker: <ul> <li> Comparison of genes around origin/terminus of replication within a taxonomy. Results obtained by running Clinker on a portion of 20 000 nucleotides before and after the origin/terminus of replication of all genomes belonging to the taxonomy. </li> </ul>   Violin plots: <ul> <li> Visual representation of the repartition of SkewI and GC Skew in different taxonomies of archaea and selected bacteria. </li> <li> Similar plots for TA skew, cumulative skew per codon position and cumulative skew for non-coding regions. </li> </ul>   Please refer to the readme file for further information about the results and references.

opencc-by-4.0Jul 2023View details →

dryad36/100

Data from: Uneven missing data skew phylogenomic relationships within the lories and lorikeets

Inlcuded is the supplementary data for Smith, B. T., Mauck, W. M., Benz, B., & Andersen, M. J. (2018). Uneven missing data skews phylogenomic relationships within the lories and lorikeets. BioRxiv, 398297. The resolution of the Tree of Life has accelerated with advances in DNA sequencing technology. To achieve dense taxon sampling, it is often necessary to obtain DNA from historical museum specimens to supplement modern genetic samples. However, DNA from historical material is generally degraded, which presents various challenges. In this study, we evaluated how the coverage at variant sites and missing data among historical and modern samples impacts phylogenomic inference. We explored these patterns in the brush-tongued parrots (lories and lorikeets) of Australasia by sampling ultraconserved elements in 105 taxa. Trees estimated with low coverage characters had several clades where relationships appeared to be influenced by whether the sample came from historical or modern specimens, which were not observed when more stringent filtering was applied. To assess if the topologies were affected by missing data, we performed an outlier analysis of sites and loci, and a data reduction approach where we excluded sites based on data completeness. Depending on the outlier test, 0.15% of total sites or 38% of loci were driving the topological differences among trees, and at these sites, historical samples had 10.9x more missing data than modern ones. In contrast, 70% data completeness was necessary to avoid spurious relationships. Predictive modeling found that outlier analysis scores were correlated with parsimony informative sites in the clades whose topologies changed the most by filtering. After accounting for biased loci and understanding the stability of relationships, we inferred a more robust phylogenetic hypothesis for lories and lorikeets.

opencc-zeroJul 2020View details →

dryad36/100

Data from: Skewness and index futures return

In this paper, we show that the individual skewness, defined as the average of monthly skewness across firms, performs very well at predicting the return of S\&P 500 index futures. This result holds after controlling for the liquidity risk or for the current business cycle conditions. We also find that individual skewness performs very well at predicting index futures returns out-of-sample.

opencc-zeroFeb 2020View details →

zenodo36/100

TVD differencing on three-dimensional unstructured meshes with monotonicity-preserving correction of mesh skewness (Accompanying data)

This data set contains the data accompanying the article F. Denner and B. van Wachem, TVD differencing on three-dimensional unstructured meshes with monotonicity-preserving correction of mesh skewness, Journal of Computational Physics (2015), http://dx.doi.org/10.1016/j.jcp.2015.06.008.

opencc-by-4.0Jun 2015View details →

zenodo36/100

"Adaptive Radial Projection on Fourier Magnitude Spectrum for Document Image Skew Estimation"

We build DISE2021 datasets from 95 images from DISEC2013 dataset [12], 70 images from RDCL dataset [22], and 324 images from RVL-CDIP dataset [14]. The composed datasets contains various types of documents, multiple languages, and typography features. Firstly, all the images are ensured and verified to be in a straight position. Secondly, we use the generating algorithm as in [12] to generate skew images in the range −15 to +15 skew degree. The dataset is split into two development/test sets by a ratio of 0.7/0.3 that results in 3399 development images and 1491 testing images. When generating the skew dataset in the range from −44.9 to 44.9 skew degree, we double the augmented image that results in 6980 development images and 2800 testing images.  Note: This datasets are built upon three other datasets: DISEC 2013, RVL-CDIP, RDCL 2017. So I urge you to respect their LICENSE.

opencc-by-4.0Jun 2024View details →

dryad36/100

DNA metabarcoding marker choice skews perception of marine eukaryotic biodiversity

DNA metabarcoding is an increasingly popular technique to investigate biodiversity; however, many methodological unknowns remain, especially concerning the biases resulting from marker choice. Regions of the cytochrome c oxidase subunit I (COI) and 18S rDNA (18S) genes are commonly employed "universal" markers for eukaryotes, but the extent of taxonomic biases introduced by these markers and how such biases may impact metabarcoding performance is not well quantified. Here, focusing on macro-eukaryotes, we use standardized sampling from autonomous reef monitoring structures (ARMS) deployed in the world's most biodiverse marine ecosystem, the Coral Triangle, to compare the performance of COI and 18S markers. We then compared metabarcoding data to image-based annotations of ARMS plates. Although both markers provided similar estimates of taxonomic richness and total sequence reads, marker choice skewed estimates of eukaryotic diversity. The COI marker recovered relative abundances of the dominant sessile phyla consistent with image annotations. Both COI and the image annotations provided higher relative abundance estimates of Bryozoa and Porifera and lower estimates of Chordata as compared to 18S, but 18S recovered 25% more phyla than COI. Thus, while COI more reliably reflects the occurrence of dominant sessile phyla, 18S provides a more holistic representation of overall taxonomic diversity. Ideal marker choice is, therefore, contingent on study system and research question, especially in relation to desired taxonomic resolution, and a multi-marker approach provides the greatest application across a broad range of research objectives. As metabarcoding becomes an essential tool to monitor biodiversity in our changing world, it is critical to evaluate biases associated with marker choice.

opencc-zeroJul 2021View details →

dryad36/100

Individual-based networks reveal the highly skewed interactions of a frugivore mutualist with individual plants in a diverse community

While plant-animal interactions occur fundamentally at the individual level, the bulk of research examining the mechanisms that drive interaction patterns has focused on the species or population level. In seed-dispersal mutualisms between frugivores and plants, little is known about the role of space and individual-level variation among plants in structuring patterns of frugivore foraging and, thus, seed dispersal in a plant community. Here we use an animal perspective to examine how space and variation between individual plants affect movement and visitation by frugivores foraging on individual fruiting plants. To do this, we used a spatially explicit network approach informed by observations of the movement and foraging of a frugivorous lemur species (Eulemur rubriventer) amongst individual plants in a diverse plant community in Madagascar. The resulting hierarchical networks, in which a few individual plants received the bulk of the interactions, demonstrated how a generalist frugivore species could act as an individual-plant specialist within a plant community. The few individual plants that dominated interactions with the lemurs shaped the modular spatial structure of frugivory interactions in the community and facilitated visitation to near neighbors. This interaction structure was primarily driven by extrinsic factors, as lemur movements among plants were significantly influenced by the individual plant's spatial position and the species richness of fruiting plants in its immediate neighborhood. Individual plants in central spatial locations, with a rich fruiting neighborhood and large fruit crops, received the most visits. The observed drastic inequality in the interactions of a generalist frugivore within a highly diverse plant community highlights the importance of considering individual-level variation for essential ecosystem processes, such as seed dispersal.

opencc-zeroAug 2021View details →

dryad36/100

Data for: Mechanisms that can cause population decline under heavily skewed male-biased adult sex ratios

<ol> <li>While adult sex ratio (ASR) is a crucial component for population management, there is still a limited understanding of how its fluctuation affects population dynamics. To demonstrate mechanisms that hinder population growth under a biased ASR, we examined changes in reproductive success with ASR using a decapod crustacean exposed to female-selective harvesting. </li> <li> We examined the effect of ASR on the spawning success of females. A laboratory experiment showed that the number of eggs carried by females decreased as the proportion of males in the mating groups increased. Although the same result was not observed in data collected over 25 years in the wild, the negative effect of ASR was suggested when success in carrying eggs was considered as a spawning success. These results indicate that a surplus of males results in females failing to carry eggs, probably due to sexual coercion, and the negative effect of ASR can be detected at the population level only when the bias increases because failure in spawning success occurs in part of population. </li> <li>We experimentally examined how male-biased sex ratios affected the maintenance of genetic diversity in a population. The diversity of paternity in a clutch increased with the number of candidate fathers. However, over 50% of a clutch was fertilised by a single male regardless of the sex ratio, and the degree of diversity was less than half of the highest diversity expected in each mating group. </li> <li>We also experimentally examined the mating ability of males during the breeding season. The experiment showed that multiple mating by males could not compensate for the risk that their genotypes would be lost when multiple males competed for one female. These results suggest that a male-biased ASR could trigger a decline of genetic diversity in a population.</li> <li>We show that ASR skewed by female-selective harvesting decreases reproductive success not only of males that have few mating opportunities but also of females. We discuss that we may still underestimate the significance of ASR on population persistence due to the difficulty of revealing the effect of ASR.</li> </ol>

opencc-zeroJun 2023View details →

dryad36/100