2,220 research outputs found

    The emergence of French statistics. How mathematics entered the world of statistics in France during the 1920s

    Get PDF
    This paper concerns the emergence of modern mathematical statistics in France after the First World War. Emile Borel's achievements are presented, and especially his creation of two institutions where mathematical statistics was developed: the {\it Statistical Institute of Paris University}, (ISUP) in 1922 and above all the {\it Henri Poincar\'e Institute} (IHP) in 1928. At the IHP, a new journal {\it Annales de l'Institut Henri Poincar\'e} was created in 1931. We discuss the first papers in that journal dealing with mathematical statistics

    Could the ease of doing business be considered a predictor of countries' socio-economic wealth? An empirical analysis using pls-sem

    Get PDF
    The wealth of nations differs significantly due to different factors. One of the reasons identified by previous studies is the level of entrepreneurship promotion by governments. This aspect has scarcely been studied empirically to date. Therefore, this paper sheds some light on this regard through building a construct out of ten Ease of Doing Business Index (EDBI) measures developed by the World Bank and relating it with a construct shaped by two measures of socio-economic wealth (SEW), namely gross domestic product and the Human Development Index. To this end, we conduct a structural equation model analysis using partial least squares (PLS-SEM) method with a 2018 database comprising secondary data from 190 countries. As the main contribution of this study, the results show that good performance in the EDBI ranking predicts good performance in the SEW ranking. Additionally, this study is pioneer in the use of these rankings to build composite constructs (latent variables) and relate them. For these reasons, our findings are useful for both academia and governments responsible for promoting entrepreneurship, as this latter is identified as the key enabler of economic development

    The sky brightness and transparency in i-band at Dome A, Antarctica

    Full text link
    The i-band observing conditions at Dome A on the Antarctic plateau have been investigated using data acquired during 2008 with the Chinese Small Telescope ARray. The sky brightness, variations in atmospheric transparency, cloud cover, and the presence of aurorae are obtained from these images. The median sky brightness of moonless clear nights is 20.5 mag arcsec^{-2} in the SDSS ii band at the South Celestial Pole (which includes a contribution of about 0.06 mag from diffuse Galactic light). The median over all Moon phases in the Antarctic winter is about 19.8 mag arcsec^{-2}. There were no thick clouds in 2008. We model contributions of the Sun and the Moon to the sky background to obtain the relationship between the sky brightness and transparency. Aurorae are identified by comparing the observed sky brightness to the sky brightness expected from this model. About 2% of the images are affected by relatively strong aurorae.Comment: There are 1 Latex file and 14 figures accepted by A

    The International Trends in Plant Variety Protection

    Get PDF
    This paper examines international trends in plant variety protection, a form of intellectual property rights for plant varieties akin to patents. The TRIPs Agreement under the WTO has given a strong impetus for the universalisation of plant variety protection regimes with common standards of protection across countries. This paper argues that developed and developing countries are likely to adopt widely divergent approaches to the development of intellectual property rights for plant varieties. The special features of plant variety protection constrain the appropriability of economic returns from protected plant varieties. Consequently, in developed countries PVP is being seen as a relatively weak intellectual property right instrument. As stronger forms of protection for plant varieties become available, the importance of plant variety protection in developed countries may decline. Developing countries continue to debate the merits of extending intellectual property rights to agriculture, though they too are obliged under the TRIPs Agreement to protect plant varieties. Their concerns are focused on the “inequities†inherent in a system of plant breeders’ rights. Attempts by developing countries to incorporate farmers’ rights provisions in their PVP systems are likely to dilute the incentives for private investment in plant breeding.Intellectual Property Rights, Plant Variety Protection, Crop Production/Industries, International Relations/Trade,

    Finite Volume Cumulant Expansion in QCD-Colorless Plasma

    Get PDF
    Due to the finite size effects, the localisation of the phase transition in finite systems and the determination of its order, become an extremely difficult task, even in the simplest known cases. In order to identify and locate the finite volume transition point T0(V)T_{0}(V) of the QCD deconfinement phase transition to a Colorless QGP, we have developed a new approach using the finite size cumulant expansion of the order parameter and the LmnL_{mn}-method. The first six cumulants C1,2,3,4,5,6C_{1,2,3,4,5,6} with the corresponding under-normalized ratios(skewness Σ\Sigma, kurtosis κ\kappa ,pentosis Π±\Pi_{\pm} and hexosis H1,2,3\mathcal{H}_{1,2,3}) and three unnormalized combinations of them (O=σ2κΣ−1\mathcal{O}={\mathcal{\sigma }^{2} \mathcal{\kappa } }{\mathbf{\Sigma }^{-1} }, U=σ−2Σ−1\mathcal{U} ={\mathcal{\sigma }^{-2} \mathbf{\Sigma }^{-1} }, N=σ2κ\mathcal{N} = \mathcal{\sigma }^{2} \mathcal{\kappa }) are calculated and studied as functions of (T,V)(T,V). A new approach, unifying in a clear and consistent way the definitions of cumulant ratios, is proposed. A numerical FSS analysis of the obtained results has allowed us to locate accurately the finite volume transition point. The extracted transition temperature value T0(V)T_{0}(V) agrees with that expected T0N(V)T_{0}^{N}(V) from the order parameter and the thermal susceptibility χT(T,V)\chi _{T}\left( T,V\right), according to the standard procedure of localization to within about 2%2\%. In addition to this, a very good correlation factor is obtained proving the validity of our cumulants method. The agreement of our results with those obtained by means of other models is remarkable.Comment: 19 pages,14 figues, figures 4,5,6 figures are oversized, therefore, can be obtained directly from [email protected],Accepted for publication in EPJ

    An Edgeworth-type expansion for the distribution of a likelihood-based discriminant function

    Get PDF
    The exact distribution of a classification function is often complicated to allow for easy numerical calculations of misclassification errors. The use of expansions is one way of dealing with this difficulty. In this paper, approximate probabilities of misclassification of the maximum likelihood-based discriminant function are established via an Edgeworth-type expansion based on the standard normal distribution for discriminating between two multivariate normal populations

    Spartan Daily, November 27, 1939

    Get PDF
    Volume 28, Issue 46https://scholarworks.sjsu.edu/spartandaily/2992/thumbnail.jp

    Morehead State University 2000 Eagle Soccer

    Get PDF
    The 2000 official media guide of the Morehead State University soccer team.https://scholarworks.moreheadstate.edu/msu_sports_programs/1115/thumbnail.jp

    Multiwavelength observations of a bright impact flash during the January 2019 total lunar eclipse

    Get PDF
    We discuss here a lunar impact flash recorded during the total lunar eclipse that occurred on 2019 January 21, at 4h 41m 38.09 +- 0.01 s UT. This is the first time ever that an impact flash is unambiguously recorded during a lunar eclipse and discussed in the scientific literature, and the first time that lunar impact flash observations in more than two wavelengths are reported. The impact event was observed by different instruments in the framework of the MIDAS survey. It was also spotted by casual observers that were taking images of the eclipse. The flash lasted 0.28 seconds and its peak luminosity in visible band was equivalent to the brightness of a mag. 4.2 star. The projectile hit the Moon at the coordinates 29.2 +- 0.3 ∘^{\circ}S, 67.5 +- 0.4 ∘^{\circ}W. In this work we have investigated the most likely source of the projectile, and the diameter of the new crater generated by the collision has been calculated. In addition, the temperature of the lunar impact flash is derived from the multiwavelength observations. These indicate that the blackbody temperature of this flash was of about 5700 K.Comment: Accepted for publication in MNRAS on 2019 March 2
    • …
    corecore