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Journal articles on the topic 'Bimodality index'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Christiansen, Bo. "Bimodality of the Planetary-Scale Atmospheric Wave Amplitude Index." Journal of the Atmospheric Sciences 62, no. 7 (2005): 2528–41. http://dx.doi.org/10.1175/jas3490.1.

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Abstract The evidence for multiple flow regimes in the planetary-scale atmospheric wave amplitude index (WAI) is studied using the 56 winters from the NCEP reanalysis data. The regimes are identified by bimodality in the probability density estimates. Both the probability density of the WAI alone and the probability density in the two-dimensional space spanned by the WAI and its temporal rate of change are examined. The latter procedure allows us to exploit the quasi stationarity of the regimes and increase the statistical significance. The statistical significance of bimodality in the probabi

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2

Ambaum, Maarten H. P. "Unimodality of Wave Amplitude in the Northern Hemisphere." Journal of the Atmospheric Sciences 65, no. 3 (2008): 1077–86. http://dx.doi.org/10.1175/2007jas2298.1.

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Abstract A novel statistic for local wave amplitude of the 500-hPa geopotential height field is introduced. The statistic uses a Hilbert transform to define a longitudinal wave envelope and dynamical latitude weighting to define the latitudes of interest. Here it is used to detect the existence, or otherwise, of multimodality in its distribution function. The empirical distribution function for the 1960–2000 period is close to a Weibull distribution with shape parameters between 2 and 3. There is substantial interdecadal variability but no apparent local multimodality or bimodality. The zonall

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3

Ertel, Adam. "Article Commentary: Bimodal Gene expression and Biomarker Discovery." Cancer Informatics 9 (January 2010): CIN.S3456. http://dx.doi.org/10.4137/cin.s3456.

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With insights gained through molecular profiling, cancer is recognized as a heterogeneous disease with distinct subtypes and outcomes that can be predicted by a limited number of biomarkers. Statistical methods such as supervised classification and machine learning identify distinguishing features associated with disease subtype but are not necessarily clear or interpretable on a biological level. Genes with bimodal transcript expression, however, may serve as excellent candidates for disease biomarkers with each mode of expression readily interpretable as a biological state. The recent articl

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4

Jackwerth, Jens. "What Do Index Options Teach Us About COVID-19?" Review of Asset Pricing Studies 10, no. 4 (2020): 618–34. http://dx.doi.org/10.1093/rapstu/raaa012.

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Abstract Risk-neutral distributions of the S&P 500 are informative about the COVID-19 pandemic beyond what one can learn from index values and the market fear gauge of the VIX alone. We learn that, on February 20, 2020, the index did not yet reflect the impending crisis. Only on March 16, 2020, was the full impact visible, with a pronounced bimodality for longer-maturity options revealing a sizeable crash scenario. The corresponding physical distribution is more symmetric and features a high-volatility crash scenario. Firms bought crash protection ahead of the index crash, whereas retail c

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Drory, Niv, and David B. Fisher. "A connection between bulge properties and the bimodality of galaxies." Proceedings of the International Astronomical Union 3, S245 (2007): 67–70. http://dx.doi.org/10.1017/s1743921308017304.

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AbstractThe global colors and structure of galaxies have recently been shown to follow bimodal distributions. Galaxies separate into a “red sequence”, populated prototypically by early-type galaxies, and a “blue cloud”, whose typical objects are late-type disk galaxies. Intermediate-type (Sa-Sbc) galaxies populate both regions. It has been suggested that this bimodality reflects the two-component nature of disk-bulge galaxies. However, it has now been established that there are two types of bulges: “classical bulges” that are dynamically hot systems resembling (little) ellipticals, and “pseudo

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Chen, Xin, Lingling Hu, Yuan Wang, Weijun Sun, and Chao Yang. "Single Cell Gene Co-Expression Network Reveals FECH/CROT Signature as a Prognostic Marker." Cells 8, no. 7 (2019): 698. http://dx.doi.org/10.3390/cells8070698.

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Aberrant activation of signaling pathways is frequently observed and reported to be associated with the progression and poor prognosis of prostate cancer (PCa). We aimed to identify key biological processes regulated by androgen receptor (AR) using gene co-expression network from single cell resolution. The bimodal index was used to evaluate whether two subpopulations exist among the single cells. Gene expression among single cells revealed averaging pitfalls and bimodality pattern. Weighted gene co-expression network analysis (WGCNA) was used to identify modules of highly correlated genes. Tw

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Wang, Jing, Sijin Wen, W. Fraser Symmans, Lajos Pusztai, and Kevin R. Coombes. "The Bimodality Index: A criterion for Discovering and Ranking Bimodal Signatures from Cancer Gene Expression Profiling Data." Cancer Informatics 7 (January 2009): CIN.S2846. http://dx.doi.org/10.4137/cin.s2846.

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8

Tempaku, PF, JR Arruda, DR Mazzotti, et al. "0683 ASSOCIATION BETWEEN, BIMODALITY INDEX, PER3 GENOTYPES, AGING AND SLEEPINESS IN A POPULATION BASED COHORT IN BRAZIL." Sleep 40, suppl_1 (2017): A253. http://dx.doi.org/10.1093/sleepj/zsx050.682.

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Christiansen, Bo. "Is the Atmosphere Interesting? A Projection Pursuit Study of the Circulation in the Northern Hemisphere Winter." Journal of Climate 22, no. 5 (2009): 1239–54. http://dx.doi.org/10.1175/2008jcli2633.1.

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Abstract The Northern Hemisphere winter circulation is probed for deviations from Gaussianity. A projection pursuit approach is applied that searches for directions in phase space that maximize an index of interest. Different indices gauging different aspects of non-Gaussianity such as flatness, bimodality, and multimodality are considered. The projection pursuit approach allows high-dimensional data spaces to be investigated and it therefore complements previous studies that usually have been confined to spaces of a few dimensions. Both stratospheric and tropospheric circulations are studied

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10

Lee, Min-Sun, Kyung-Ae Park, and Fiorenza Micheli. "Derivation of Red Tide Index and Density Using Geostationary Ocean Color Imager (GOCI) Data." Remote Sensing 13, no. 2 (2021): 298. http://dx.doi.org/10.3390/rs13020298.

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Red tide causes significant damage to marine resources such as aquaculture and fisheries in coastal regions. Such red tide events occur globally, across latitudes and ocean ecoregions. Satellite observations can be an effective tool for tracking and investigating red tides and have great potential for informing strategies to minimize their impacts on coastal fisheries. However, previous satellite-based red tide detection algorithms have been mostly conducted over short time scales and within relatively small areas, and have shown significant differences from actual field data, highlighting a n

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11

Karn, Thomas, Lajos Pusztai, Eugen Ruckhäberle, et al. "Melanoma antigen family A identified by the bimodality index defines a subset of triple negative breast cancers as candidates for immune response augmentation." European Journal of Cancer 48, no. 1 (2012): 12–23. http://dx.doi.org/10.1016/j.ejca.2011.06.025.

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12

Fu, Fengjie, Dongfang Ma, Dianhai Wang, and Wei Qian. "An Optimization Method of Time Window Based on Travel Time and Reliability." Mathematical Problems in Engineering 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/921480.

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The dynamic change of urban road travel time was analyzed using video image detector data, and it showed cyclic variation, so the signal cycle length at the upstream intersection was conducted as the basic unit of time window; there was some evidence of bimodality in the actual travel time distributions; therefore, the fitting parameters of the travel time bimodal distribution were estimated using the EM algorithm. Then the weighted average value of the two means was indicated as the travel time estimation value, and the Modified Buffer Time Index (MBIT) was expressed as travel time variabilit

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13

Geisler, D., and M. G. Lee. "Multimodal Color Distributions in the Globular Cluster Systems of Giant Elliptical Galaxies." Symposium - International Astronomical Union 186 (1999): 197. http://dx.doi.org/10.1017/s0074180900112574.

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We report on new observations of the globular cluster systems (GCSs) of two galaxies: M86 (NGC 4406) in Virgo and NGC 4696, the central giant elliptical (gE) in the Centaurus cluster. Previous observations in M86 showed no evidence for bimodality, but using only (V - I) for small cluster samples. The NGC 4696 GCS is unstudied. We used the integrated Washington (C - T1) color. This metallicity index is more than twice as sensitive to [Fe/H] as (V - I). In M86 we have about 1100 good GC candidates, and about 650 in NGC 4696, with mean internal metallicity errors ~ 0.15 dex. Both of these GCSs ar

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14

DeAngelis, Gregory C., and Takanori Uka. "Coding of Horizontal Disparity and Velocity by MT Neurons in the Alert Macaque." Journal of Neurophysiology 89, no. 2 (2003): 1094–111. http://dx.doi.org/10.1152/jn.00717.2002.

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We performed the first large-scale ( n = 501), quantitative study of horizontal disparity tuning in the middle temporal (MT) visual area of alert, fixating macaque monkeys. Using random-dot stereograms, we quantified the direction tuning, speed tuning, horizontal disparity tuning, and size tuning of each neuron. The vast majority (93%) of MT neurons were significantly tuned for horizontal disparity. Although disparity tuning was generally quite robust, the average disparity sensitivity of MT neurons was significantly weaker than their direction or speed sensitivity as quantified using both an

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15

Boro Saikia, S., C. J. Marvin, S. V. Jeffers, et al. "Chromospheric activity catalogue of 4454 cool stars." Astronomy & Astrophysics 616 (August 2018): A108. http://dx.doi.org/10.1051/0004-6361/201629518.

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Context.Chromospheric activity monitoring of a wide range of cool stars can provide valuable information on stellar magnetic activity and its dependence on fundamental stellar parameters such as effective temperature and rotation.Aims.We compile a chromospheric activity catalogue of 4454 cool stars from a combination of archival HARPS spectra and multiple other surveys, including the Mount Wilson data that have recently been released by the NSO. We explore the variation in chromospheric activity of cool stars along the main sequence for stars with different effective temperatures. Additionally

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16

Aoki, Kunihiro, Yasumasa Miyazawa, Tsutomu Hihara, and Toru Miyama. "An Objective Method for Probabilistic Forecasting of Multimodal Kuroshio States using Ensemble Simulation and Machine Learning." Journal of Physical Oceanography 50, no. 11 (2020): 3189–204. http://dx.doi.org/10.1175/jpo-d-19-0316.1.

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AbstractThis paper presents a method for detecting the ensemble means, spreads, and occurrence probabilities for each of the multiple Kuroshio states. This is accomplished by classifying the forecasts of the ensemble members with a Gaussian mixture distribution model, a machine learning method. Ensemble simulations with 80 members are conducted to reproduce possible occurrences of the multiple Kuroshio states, targeting the large meander event in 2017. To test its performance, first, the method is applied for the southernmost latitude, a conventional index that represents meander intensity. Th

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17

Manney, Gloria L., Michelle L. Santee, Zachary D. Lawrence, Krzysztof Wargan, and Michael J. Schwartz. "A Moments View of Climatology and Variability of the Asian Summer Monsoon Anticyclone." Journal of Climate 34, no. 19 (2021): 7821–41. http://dx.doi.org/10.1175/jcli-d-20-0729.1.

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AbstractA comprehensive investigation of the climatology of and interannual variability and trends in the Asian summer monsoon anticyclone (ASMA) is presented, based on a novel area and moments analysis. Moments include centroid location, aspect ratio, angle, and “excess kurtosis” (measuring how far the shape is from elliptical) for an equivalent ellipse with the same area as the ASMA. Key results are robust among the three modern reanalyses studied. The climatological ASMA is nearly elliptical, with its major axis aligned along its centroid latitude and a typical aspect ratio of ~5–8. The ASM

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18

Sharma, K., P. Sharma, A. Sharma, and G. Singh. "Phenylthiocarbamide taste perception and susceptibility to motion sickness: linking higher susceptibility with higher phenylthiocarbamide taste acuity." Journal of Laryngology & Otology 122, no. 10 (2008): 1064–73. http://dx.doi.org/10.1017/s0022215107001442.

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AbstractObjective:This study is the first attempt to link quantified phenylthiocarbamide bitter taste recognition threshold with susceptibility to motion sickness.Subjects:The study was conducted on a sample of 291 teenage Rajput children (146 males and 145 females; age range 13–19 years) from the Sirmour district of Himachal Pradesh, India. Phenylthiocarbamide taste sensitivity was measured by administering a serial dilution of a freshly prepared phenylthiocarbamide solution, following the method of Harris and Kalmus. Motion sickness susceptibility was assessed retrospectively via interview.R

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19

Werle, Ariel. "Unveiling the afterlife of galaxies with ultraviolet data." Proceedings of the International Astronomical Union 15, S359 (2020): 467–68. http://dx.doi.org/10.1017/s1743921320001611.

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Abstract. Recent works have shown that early-type galaxies (ETGs) are much more complex than early studies suggested. We present early results from a combined analysis of optical spectra and ultraviolet photometry for a sample of 3453 red sequence galaxies in at z < 0.1 that are classified as elliptical by Galaxy Zoo. By measuring the Gini index of the star-formation histories derived by starlight, we investigate the complexity of the mixture of stellar populations required to describe ETGs in our sample. When fitting only optical spectra, starlight assigns more or less the same mixture of

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20

Shay, Jennifer M., A. J. Macaulay, and K. A. Frego. "A morphological comparison of Scirpus acutus and S. validus in southern Manitoba." Canadian Journal of Botany 66, no. 11 (1988): 2331–37. http://dx.doi.org/10.1139/b88-317.

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Sixty stands of Scirpus acutus Muhl. and S. validus Vahl from five areas in southern Manitoba were examined to determine (i) whether the two were morphologically distinguishable within the region studied and, if so, (ii) which morphological characters were the most useful to separate them. Thirteen characters were measured on pressed and living specimens. From these, six bimodally distributed characters were objectively selected to calculate a biometric index for each specimen. Mean indices for 56 stands were separable into two groups, indicating that they contained pure populations of one tax

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21

Tran, Thao, Cara Wiskow, and Mohammad Aziz. "Skewed and Flexible Skewed Distributions: A Modern Look at the Distribution of BMI." Volume 14, Issue 2 14, no. 2 (2017). http://dx.doi.org/10.33697/ajur.2017.013.

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The purpose of this study is to find distributions that best model body mass index (BMI) data. BMI has become a standard health indicator and numerous studies have been done to examine the distribution of BMI. Due to the skew and bimodal nature, we focus on modeling BMI with flexible skewed distributions. The distributions are fitted to University of Wisconsin–Eau Claire (UWEC) BMI data and to a data obtained from National Health and Nutrition Survey (NHANES). The model parameters are obtained using maximum likelihood estimation method. We compare flexible models to more conventional distribut

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