11,036 research outputs found
A Generalized Jarque-Bera Test of Conditional Normality
We consider testing normality in a general class of models that admits nonlinear conditional mean and conditional variance functions. We derive the asymptotic distribution of the skewness and kurtosis coefficients of the model’s standardized residuals and propose an asymptotic x2 test of normality. This test simplifies to the Jarque-Bera test only when: (i) the conditional mean function contains an intercept term but does not depend on past errors, and (ii) the errors are conditionally homoskedastic. Beyond this context, it is shown that the Jarque-Bera test has size distortion but the proposed test does not.conditional heteroskedsaticity, conditional normality, Jarque-Bera test
Unifying and Merging Well-trained Deep Neural Networks for Inference Stage
We propose a novel method to merge convolutional neural-nets for the
inference stage. Given two well-trained networks that may have different
architectures that handle different tasks, our method aligns the layers of the
original networks and merges them into a unified model by sharing the
representative codes of weights. The shared weights are further re-trained to
fine-tune the performance of the merged model. The proposed method effectively
produces a compact model that may run original tasks simultaneously on
resource-limited devices. As it preserves the general architectures and
leverages the co-used weights of well-trained networks, a substantial training
overhead can be reduced to shorten the system development time. Experimental
results demonstrate a satisfactory performance and validate the effectiveness
of the method.Comment: To appear in the 27th International Joint Conference on Artificial
Intelligence and the 23rd European Conference on Artificial Intelligence,
2018. (IJCAI-ECAI 2018
Probing triple-Higgs productions via decay channel at a 100 TeV hadron collider
The quartic self-coupling of the Standard Model Higgs boson can only be
measured by observing the triple-Higgs production process, but it is
challenging for the Large Hadron Collider (LHC) Run 2 or International Linear
Collider (ILC) at a few TeV because of its extremely small production rate. In
this paper, we present a detailed Monte Carlo simulation study of the
triple-Higgs production through gluon fusion at a 100 TeV hadron collider and
explore the feasibility of observing this production mode. We focus on the
decay channel , investigating
detector effects and optimizing the kinematic cuts to discriminate the signal
from the backgrounds. Our study shows that, in order to observe the Standard
Model triple-Higgs signal, the integrated luminosity of a 100 TeV hadron
collider should be greater than ab. We also explore the
dependence of the cross section upon the trilinear () and quartic
() self-couplings of the Higgs. We find that, through a search in
the triple-Higgs production, the parameters and can be
restricted to the ranges and , respectively. We also
examine how new physics can change the production rate of triple-Higgs events.
For example, in the singlet extension of the Standard Model, we find that the
triple-Higgs production rate can be increased by a factor of .Comment: 33 pages, 11 figures, added references, corrected typos, improved
text, affiliation is changed. This is the publication versio
Learning performance assessment approach using learning portfolio for e-learning systems
Learning performance assessment aims to evaluate what learners learnt during the learning process. In recent years, how to perform the learning performance assessment is a critical issue in the web-based learning field. The traditional summative evaluation can be applied to evaluate the learning performance both for the conventional classroom learning and web-based learning. However, it only considers final learning outcomes without considering the learning progress of learners. This paper proposes a learning performance assessment approach which combines four computational intelligence theories including grey relational analysis, K-means clustering method, fuzzy association rule mining and fuzzy inference to perform this task based on the learning portfolio of individual learner. Experimental results indicate that the evaluation result of proposed method is positive relevance with those of summative assessment. Namely, this method can help teachers to precisely perform the formative assessment for individual learner utilizing only the learning portfolio in web-based learning environment. 1
- …