2,220 research outputs found
The emergence of French statistics. How mathematics entered the world of statistics in France during the 1920s
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
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
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
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
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
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 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 -method.
The first six cumulants with the corresponding
under-normalized ratios(skewness , kurtosis ,pentosis
and hexosis ) and three unnormalized
combinations of them (, , ) are calculated and studied as functions of . 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 agrees with that expected from the
order parameter and the thermal susceptibility ,
according to the standard procedure of localization to within about . 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
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
Volume 28, Issue 46https://scholarworks.sjsu.edu/spartandaily/2992/thumbnail.jp
Morehead State University 2000 Eagle Soccer
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
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 S, 67.5 +- 0.4
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
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