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15132. The LASSO estimator: distributional properties
- Creator:
- Jagannath, Rakshith and Upadhye, Neelesh S.
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- linear regression, LASSO, characteristic function, finite sample probability distribution function, Fourier-Slice theorem, and Cramer-Wold theorem
- Language:
- English
- Description:
- The least absolute shrinkage and selection operator (LASSO) is a popular technique for simultaneous estimation and model selection. There have been a lot of studies on the large sample asymptotic distributional properties of the LASSO estimator, but it is also well-known that the asymptotic results can give a wrong picture of the LASSO estimator's actual finite-sample behaviour. The finite sample distribution of the LASSO estimator has been previously studied for the special case of orthogonal models. The aim in this work is to generalize the finite sample distribution properties of LASSO estimator for a real and linear measurement model in Gaussian noise. In this work, we derive an expression for the finite sample characteristic function of the LASSO estimator, we then use the Fourier slice theorem to obtain an approximate expression for the marginal probability density functions of the one-dimensional components of a linear transformation of the LASSO estimator.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
15133. The late miocene pelitic siltstone of the Ishim Formation (Southwestern Siberia): mineralogical and geomechanical characterization and prospects for further use
- Creator:
- Konstantinov, Alexander O, Smirnov, Pavel V, Kuzmina, Olga B, Khazina, Irina V, Batalin, Georgii A, and Gareev, Bulat I
- Format:
- print, bez média, and svazek
- Type:
- model:article and TEXT
- Subject:
- sedimentární horniny, plniva, sedimentary rocks, fillers (materials), Sibiř západní (Rusko), Siberia, Western (Russia), late miocene, pelitic siltstone, mineral addiction, 7, and 551
- Language:
- English
- Description:
- a1_The Miocene Ishim Formation is characterized by a considerable distribution area within the southwestern Siberia. These deposits are highly dispersed and are composed mainly of angular quartz grains of aleuritic and pelitic fractions. The study of the Ishim Formation is of interest both for investigating the origin of the sediments, and for justifying these rocks as a new type of mineral raw material for the local construction materials industry. This paper presents the results of first complex studies of the Ishim Formation deposits from two outcrops Masali and Bigila. The studies included determination of the particle size distribution on the laser particle analyzer, semiquantitative determination of the mineral composition (X-ray diffraction analysis), as well as, determination of contents of sesquioxides (X-ray fluorescence analysis), rare and trace elements (Inductively Coupled Plasma Mass Spectrometry) and measurement of specific surface area. The most representative samples were chosen for petrographic studies. In certain extent these deposits are characterized by quite high degree of homogeneity of the mineral, chemical, and granulometric compositions. The main component is SiO2 (about 70 %); other most important components are Al2O3 (about 14 %) and Fe2O3 (2-5 %). At the same time, deposits of the upper part of the Ishim Formation are depleted in CaO, MnO, MgO, TiO2, and P2O5. This is probably due to the fact that the proportion of clayey minerals in the upper part of the formation is lower than that in the lower one. The contents of trace elements in the Ishim Formation are lower or close to their clarke values in the Earth's crust. This is with the exception of such elements as Eu, Tb, Cr, and Sb, which form a strong anomaly and, to a lesser extent, a number of other elements that is probably related to the tectonic setting during the period of sedimentation., a2_The CIA values vary from 68-70 in the lower unit of the Ishim Formation at the transition to the sandy facies to 75-80 in the upper one, which indicates a moderate weathering of rocks. The results obtained testify to the fact that these deposits were formed under the conditions of degrading shallow water bodies. A distinct geomorphological confinement to boundaries of the Neogene river paleovalleys, continuity, high dispersion and, predominantly, quartz composition allow us to consider these deposits as a promising type of filler for construction materials industry., Alexander O. Konstantinov, Pavel V. Smirnov, Olga B. Kuzmina, Irina V. Khazina, Georgii A. Batalin and Bulat I. Gareev., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
15134. The least trimmed squares. Part I. Consistency
- Creator:
- Víšek, Jan Ámos
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- robust regression, the least trimmed squares, consistency, and discussion of assumptions and of algorithm for evaluation of estimator
- Language:
- English
- Description:
- The consistency of the least trimmed squares estimator (see Rousseeuw \cite{Rous} or Hampel et al. \cite{HamRonRouSta}) is proved under general conditions. The assumptions employed in paper are discussed in details to clarify the consequences for the applications.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
15135. The least trimmed squares. Part II.. n−−√-consistency
- Creator:
- Víšek, Jan Ámos
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- robust regression, the least trimmed squares, n−−√-constistency, and asymptotic normality
- Language:
- English
- Description:
- n−−√-consistency of the least trimmed squares estimator is proved under general conditions. The proof is based on deriving the asymptotic linearity of normal equations.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
15136. The least trimmed squares. Part III.. Asymptotic normality
- Creator:
- Víšek, Jan Ámos
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- robust regression, the least trimmed squares, n−−√-consistency, and asymptotic normality
- Language:
- English
- Description:
- Asymptotic normality of the least trimmed squares estimator is proved under general conditions. At the end of paper a discussion of applicability of the estimator (including the discussion of algorithm for its evaluation) is offered.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
15137. The level of nickel in smoker's blood and urine
- Creator:
- Stojanović, Dusica
- Type:
- model:article and TEXT
- Language:
- English
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
15138. The Libechov minipig as a large animal model for preclinical research in Huntington’s disease – thoughts and perspectives
- Creator:
- Schramke, S., Schubert, R., Frank, F., Wirsig, M., Fels, M., Kemper, N., Schuldenzucker, V., and Reilmann, R.
- Format:
- print, text, and regular print
- Type:
- model:article, article, Text, práce podpořená grantem, and TEXT
- Subject:
- zvířata, zvířata geneticky modifikovaná, prasata, prasata miniaturní, modely u zvířat, preklinické hodnocení léčiv, Huntingtonova nemoc, chov, bydlení zvířat, časové faktory, mozek--anatomie a histologie, velikost orgánu, experimenty na zvířatech, etika výzkumu, and sekvenční homologie
- Language:
- Czech and English
- Description:
- Large animal models to explore the safety and tolerability of novel therapeutic approaches for Huntington’s disease (HD) are in exploration to achieve higher translational reliability in future studies. Recently, a Libechov minipig has been established as one new transgenic (Tg) large animal model for HD. We here discuss the advantages and limitations in using this model in HD with regards to breeding, housing, handling, and with respect to homology to humans and ethical considerations. A group of TgHD and wild type (WT) female minipigs (n = 36) was used to gain first evidence about abovementioned aspects. It is concluded that Libechov minipigs may fulfill an important role to bridge the gap between rodents and non‑human primates in the translation to humans. and S. Schramke, R. Schubert, F. Frank, M. Wirsig, M. Fels, N. Kemper, V. Schuldenzucker, R. Reilmann
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
15139. The life and times of Master John Hus
- Creator:
- František Lützow
- Publisher:
- J.M. Dent & Co.
- Format:
- print, svazek, and ix, 398 stran : portréty.
- Type:
- model:monograph and TEXT
- Subject:
- Dějiny Česka a Slovenska, Biografie, Hus, Jan, asi 1371-1415, dějiny, reformace, křesťanští teologové, křesťanští reformátoři, Česko, 94(437), 27-9"14/15", 27-337, (437.3), (092), 8, and 929
- Language:
- English
- Description:
- by the Count Lützow., KČSN - S-D 292, Obsahuje rejstřík, and Obsahuje české věnování od autora - S-D 292
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
15140. The life cycle of Huffmanela huffmani Moravec, 1987 (Nematoda: Trichosomoididae), an endemic marine-relict parasite of Centrarchidae from a Central Texas spring
- Creator:
- Worsham, McLean L. D, Huffman, David G, František Moravec, and Gibson, J. Randy
- Format:
- print, počítač, and online zdroj
- Type:
- model:article and TEXT
- Subject:
- různonožci, ryby, parazitologie, Amphipoda, fishes, parasitology, Spojené státy americké, United States, swim bladder nematode, Trichinelloidea, intermediate host, development, Hyalella, Gammarus, 2, and 59
- Language:
- English
- Description:
- The life cycle of the swim bladder nematode Huffmanela huffmani Moravec, 1987 (Trichinelloidea: Trichosomoididae), an endemic parasite of centrarchid fishes in the upper spring run of the San Marcos River in Hays County, Texas, USA, was experimentally completed. The amphipods Hyalella cf. azteca (Saussure), Hyalella sp. and Gammarus sp. were successfully infected with larvated eggs of Huffmanela huffmani. After ingestion of eggs of H. huffmani by experimental amphipods, the first-stage larvae hatch from their eggshells and penetrate through the digestive tract to the hemocoel of the amphipod. Within about 5 days in the hemocoel of the experimental amphipods at 22 °C, the larvae presumably attained the second larval stage and were infective for the experimental centrarchid definitive hosts, Lepomis spp. The minimum incubation period before adult nematodes began laying eggs in the swim bladders of the definitive hosts was found to be about 7.5 months at 22 °C. This is the first experimentally completed life cycle within the Huffmanelinae., McLean L. D. Worsham, David G. Huffman, František Moravec, J. Randy Gibson., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public