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Maximally selected chi-square statistics and umbrella orderings
Full text linkBinary outcomes that depend on an ordinal predictor in a non-monotonic way are common in medical data analysis. Such patterns can be addressed in terms of cutpoints: for example, one looks for two cutpoints that define an interval in the range of the ordinal predictor for which the probability of a positive outcome is particularly high (or low). A chi-square test may then be performed to compare the proportions of positive outcomes in and outside this interval. However, if the two cutpoints are chosen to maximize the chi-square statistic, referring the obtained chi-square statistic to the standard chi-square distribution is an inappropriate approach. It is then necessary to correct the p-value for multiple comparisons by considering the distribution of the maximally selected chi-square statistic instead of the nominal chi-square distribution. Here, we derive the exact distribution of the chi-square statistic obtained by the optimal two cutpoints. We suggest a combinatorial computation method and illustrate our approach by a simulation study and an application to varicella data
Monotonicity of Chi-square Test Statistics
Full text linkThis paper establishes monotonicity of the chi-square test statistic. As the more efficient parameter estimator is plugged into the test statistic, the degrees of freedom of the resulting chi-square test statistic monotonically increase.
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The Hexagon of Alpha Chi Sigma
Full text linkQuarterly publication of the Alpha Chi Sigma chemistry fraternity containing articles related to chemistry research and the activities of the organization, including local chapters and groups
Chi-Chi Earthquake Memorial Park - Spazio pubblico e memoriale
No full textProgetto Chi-Chi Earthquake Memorial Park - Spazio pubblico e memoriale. Principali riferimenti: Mostre: 1. "Actar Arquitectura: Land-Links". Gliptoteca de Zagreb, 2006, 2. Primera Bienal de Canarias - "Land-Links"/Actar Arquitectura (Escenarios de crecimiento), Centro Cultural La Regenta, Las Palmas de Gran Canarias, 2006, 3. Rotterdam, NAI – "Actar Arquitectura: Land-Links" (Dynami-City) 2006, 4. Arquitectura Catalana al Món -collettiva. Departament de Relacions Internacionals COAC, Col.legi d ́Arquitectes de Catalunya, 2006 // Catáloghi: 1.GANDOLFI, Emiliano: Dynami-City, ed. NAI, Rotterdam Marzo 2006, 2. V.V.A.A. Arquitectura Catalana al Món, ed. Departament de Relacions Internacionals COAC, Col.legi d ́Arquitectes de Catalunya, Barcelona, 2005, 3. Chichi Earthquake Memorial Competition, , ed. AIROQ of China, Taiwan 2004 // Reviste: 1. Metamorfosi n. 54, Roma 2005
Ar-CHI-tecture: Architecture and Interaction
No full textThe rise of ubiquitous computing leads to a natural convergence between the areas of architectural design (the design of buildings, spaces and experience of being in and moving through them) and HCI. We suggest that Architecture and CHI have much to learn from each other in terms of research and practice. This workshop will bring together these communities to explore the benefits of architecture envisioned as integral to an expanded CHI community. The workshop organizers aim to create a framework for future collaboration and identify new directions for research in this multidisciplinary field. This promises significant impacts on both interaction research and its real-world applications
Recommended from our members
The Hexagon of Alpha Chi Sigma
No full textQuarterly publication of the Alpha Chi Sigma chemistry fraternity containing articles related to chemistry research and the activities of the organization, including local chapters and groups
Recommended from our members
The Hexagon of Alpha Chi Sigma
No full textQuarterly publication of the Alpha Chi Sigma chemistry fraternity containing articles related to chemistry research and the activities of the organization, including local chapters and groups
Recommended from our members
The Hexagon of Alpha Chi Sigma
No full textQuarterly publication of the Alpha Chi Sigma chemistry fraternity containing articles related to chemistry research and the activities of the organization, including local chapters and groups
Chi-infect5_3species.R
No full textR-script modified from Statistical tools for high-throughput data
analysis (STHDA) (http://www.sthda.com/english/wiki/chi-square-test-of-independence-in-r). Calculation Pearsons chi-square test for prevalence differences in different species and different lakes</div
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