Zobrazeno 1 - 10
of 432
pro vyhledávání: 'Højsgaard, Søren'
The capability of R to do symbolic mathematics is enhanced by the caracas package. This package uses the Python computer algebra library SymPy as a back-end but caracas is tightly integrated in the R environment. This enables the R user with symbolic
Externí odkaz:
http://arxiv.org/abs/2301.13777
We propose Unity Smoothing (US) for handling inconsistencies between a Bayesian network model and new unseen observations. We show that prediction accuracy, using the junction tree algorithm with US is comparable to that of Laplace smoothing. Moreove
Externí odkaz:
http://arxiv.org/abs/2201.08659
Autor:
Højsgaard, Søren, Lauritzen, Steffen
In Gaussian graphical models, the likelihood equations must typically be solved iteratively. We investigate two algorithms: A version of iterative proportional scaling which avoids inversion of large matrices, and an algorithm based on convex duality
Externí odkaz:
http://arxiv.org/abs/2112.10388
Autor:
Andersen, Mikkel Meyer1 mikl@math.aau.dk, Højsgaard, Søren1 sorenh@math.aau.dk
Publikováno v:
R Journal. Dec2023, Vol. 15 Issue 4, p181-197. 17p.
The capability of R to do symbolic mathematics is enhanced by the caracas package. This package uses the Python computer algebra library SymPy as a back-end but caracas is tightly integrated in the R environment, thereby enabling the R user with symb
Externí odkaz:
http://arxiv.org/abs/2104.05292
A graphical model is a multivariate (potentially very high dimensional) probabilistic model, which is formed by combining lower dimensional components. Inference (computation of conditional probabilities) is based on message passing algorithms that u
Externí odkaz:
http://arxiv.org/abs/2103.03647
Autor:
Hojsgaard, Soren
There are two main objectives of this paper. The first is to present a statistical framework for models with context specific independence structures, i.e., conditional independences holding only for sepcific values of the conditioning variables. Thi
Externí odkaz:
http://arxiv.org/abs/1301.3863
Publikováno v:
Antioxidants, Vol 10, Iss 3, p 478 (2021)
This study investigates two levels of dietary selenium (Se) and vitamin E in combination on their status in sows and their progeny, and influence on antioxidant status and immunological responses of the piglets at weaning. Female pigs (n = 6) were pr
Externí odkaz:
https://doaj.org/article/4ef2fd65ada14f70aa9b4e35087247e0
Autor:
Ulrich Halekoh, Søren Højsgaard
Publikováno v:
Journal of Statistical Software, Vol 59, Iss 1, Pp 1-32 (2014)
When testing for reduction of the mean value structure in linear mixed models, it is common to use an asymptotic ?2 test. Such tests can, however, be very poor for small and moderate sample sizes. The pbkrtest package implements two alternatives to s
Externí odkaz:
https://doaj.org/article/6df1f5887e6141ea85273278b7bf47dd