Search results for "Statistik"
showing 10 items of 189 documents
Russische Statistik
1812
Radiācijas defektu EPR fluorīdu kristālos un oksifluorīdu stikla keramikā
2008
Elektroniskā versija nesatur pielikumus
Accessing sub-national cholera epidemiological data for Nigeria and the Democratic Republic of Congo during the seventh pandemic.
2022
Abstract Background Vibrio cholerae is a water-borne pathogen with a global burden estimate at 1.4 to 4.0 million annual cases. Over 94% of these cases are reported in Africa and more research is needed to understand cholera dynamics in the region. Cholera data are lacking, mainly due to reporting issues, creating barriers for widespread research on cholera epidemiology and management in Africa. Main body Here, we present datasets that were created to help address this gap, collating freely available sub-national cholera data for Nigeria and the Democratic Republic of Congo. The data were collated from a variety of English and French publicly available sources, including the World Health Or…
Volatility transmission patterns and terrorist attacks
2009
The objective of this study is to analyze volatility transmission between the US and Eurozone stock markets considering the effects of the September 11, March 11 and July 7 financial crises. In order to do this, we use a multivariate GARCH model and take into account the asymmetric volatility phenomenon, the non-synchronous trading problem and the crises themselves. Moreover, a graphical analysis of the Asymmetric Volatility Impulse-Response Functions (AVIRF) is introduced, which takes into consideration the crisis effect. Results suggest that there is bidirectional and asymmetric volatility transmission and show the different impact that terrorist attacks had on both markets. El objetivo d…
ISARIC-COVID-19 dataset: A Prospective, Standardized, Global Dataset of Patients Hospitalized with COVID-19
2022
The International Severe Acute Respiratory and Emerging Infection Consortium (ISARIC) COVID-19 dataset is one of the largest international databases of prospectively collected clinical data on people hospitalized with COVID-19. This dataset was compiled during the COVID-19 pandemic by a network of hospitals that collect data using the ISARIC-World Health Organization Clinical Characterization Protocol and data tools. The database includes data from more than 705,000 patients, collected in more than 60 countries and 1,500 centres worldwide. Patient data are available from acute hospital admissions with COVID-19 and outpatient follow-ups. The data include signs and symptoms, pre-existing como…
Mixture Hidden Markov Models for Sequence Data: The seqHMM Package in R
2019
Sequence analysis is being more and more widely used for the analysis of social sequences and other multivariate categorical time series data. However, it is often complex to describe, visualize, and compare large sequence data, especially when there are multiple parallel sequences per subject. Hidden (latent) Markov models (HMMs) are able to detect underlying latent structures and they can be used in various longitudinal settings: to account for measurement error, to detect unobservable states, or to compress information across several types of observations. Extending to mixture hidden Markov models (MHMMs) allows clustering data into homogeneous subsets, with or without external covariate…
KFAS : Exponential Family State Space Models in R
2017
State space modelling is an efficient and flexible method for statistical inference of a broad class of time series and other data. This paper describes an R package KFAS for state space modelling with the observations from an exponential family, namely Gaussian, Poisson, binomial, negative binomial and gamma distributions. After introducing the basic theory behind Gaussian and non-Gaussian state space models, an illustrative example of Poisson time series forecasting is provided. Finally, a comparison to alternative R packages suitable for non-Gaussian time series modelling is presented.
Acu kinemātikas mērījumi kognitīvo procesu raksturošanai
2008
Elektroniskā versija nesatur pielikumus
Turbulences raksturlielumu un daļiņu pārneses modelēšana recirkulatīvās plūsmās
2009
Turbulences raksturlielumu un daļiņu pārneses modelēšana recirkulatīvās plūsmās M. Kirpo Promocijas darba vadītājs: Dr. Phys. A. Jakovičs Anotācija Šis darbs ir veltīts turbulentās plūsmas īpašību un daļiņu dinamikas pētīšanai EM un gravitācijas spēku ietekmē indukcijas tīģeļa krāsnīs un kanālkrāsnīs. Attīstītā turbulentā plūsma ($\mathrm{Re} > 10^4$) šajās krāsnīs parasti tiek formēta ar diviem vai vairākiem vidējotiem recirkulatīviem virpuļiem un siltuma un vielas apmaiņa šādās plūsmās ir ļoti svarīga tehnoloģiskos procesos. Šis darbs izmanto pieejamus eksperimentālus rezultātus par Vuda metāla plūsmu indukcijas tīģeļkrāsnīs un kanālkrāsnīs, lai uzbūvētu un noverificētu 3D lielo virpuļu m…
Vien-dimensionāla Ridberga atoma mijiedarbība ar pusperioda impulsiem
2008
Elektroniskā versija nesatur pielikumus