Search results for "comparison"
showing 10 items of 701 documents
A comparison result for a class of semilinear elliptic equations
1997
Comparison results
Multiple solutions with sign information for a (p,2)-equation with combined nonlinearities
2020
We consider a parametric nonlinear Dirichlet problem driven by the sum of a p-Laplacian and of a Laplacian (a (p,2)-equation) and with a reaction which has the competing effects of two distinct nonlinearities. A parametric term which is (p−1)-superlinear (convex term) and a perturbation which is (p−1)-sublinear (concave term). First we show that for all small values of the parameter the problem has at least five nontrivial smooth solutions, all with sign information. Then by strengthening the regularity of the two nonlinearities we produce two more nodal solutions, for a total of seven nontrivial smooth solutions all with sign informations. Our proofs use critical point theory, critical gro…
Positive and nodal solutions for nonlinear nonhomogeneous parametric neumann problems
2020
We consider a parametric Neumann problem driven by a nonlinear nonhomogeneous differential operator plus an indefinite potential term. The reaction term is superlinear but does not satisfy the Ambrosetti-Rabinowitz condition. First we prove a bifurcation-type result describing in a precise way the dependence of the set of positive solutions on the parameter λ > 0. We also show the existence of a smallest positive solution. Similar results hold for the negative solutions and in this case we have a biggest negative solution. Finally using the extremal constant sign solutions we produce a smooth nodal solution.
Comparing medical treatment in Crohn's disease
2013
The drugs available for inflammatory bowel disease are aminosalicylates, antibiotics, steroids, immunosuppressors and biologics. The effectiveness of these drugs has been evaluated in many randomized clinical trials, mainly versus placebo. Few studies have been conducted comparing the different drugs among themselves, owing to the methodological problems raised by comparative trials, such as sample size and blindness. This review focuses mainly on the randomized clinical trials that have compared different treatments. Of course comparisons are mainly between drugs used in a particular setting (mild, moderate and severe disease). However, on many occasions there is no homogeneity in these cl…
Prioritisation of alternatives with analytical hierarchy process plus response latency and web surveys
2014
This paper introduces a new method that combines the well-known analytical hierarchy process (AHP) with a response latency metric. The response latency is the time taken by respondents to make choices over pairwise comparisons. The analytical calculation of relative importance weights of the alternatives is made by using a response latency model previously validated in several case studies. This combination aims to overcome some drawbacks of the traditional AHP related to the use of a rating scale (the so-called Saaty scale), and it is a natural way to involve response latency in established decisionmaking methods. This new method can be profitably adopted in web surveys where it is easy to…
Algorithms for Graph and Network Analysis: Graph Alignment
2019
In this article we discuss the problem of graph alignment, which has been longly referred to for the purpose of analyzing and comparing biological networks. In particular, we describe different facets of graph alignment, according to the number of input networks, the fixed output objective, the possible heterogeneity of input data. Accordingly, we will discuss pairwise and multiple alignment, global and local alignment, etc. Moreover, we provide a comprehensive overview of the algorithms and techniques proposed in the literature to solve each of the specific considered types of graph alignment. In order to make the material presented here complete and useful to guide the reader in the use o…
Assimilation and Contrast in Spontaneous Comparisons: Heterogeneous Effects of Standard Extremity in Facial Evaluations
2020
Judgments we make about others often depend on the standards we use as comparisons. Investigations into the outcomes of these comparisons and potential moderators have often been limited to single dimensions and preselected standards. The current work instead uses multiple evaluative facial dimensions and a multitude of comparisons. A series of 4 experiments ('N' = 665) attempted to detect contrast from extreme (Study 1) and assimilation to moderate standards in within (Studies 2 and 3) and between-subjects designs (Study 4). Results showed inconsistent evidence for both comparison effects and significant heterogeneity across the evaluative dimensions that were sampled. An additional 5 stud…
Problems and Adaptive Functioning Reported by Adults in 17 Societies
2016
This study tested for similarities and differences across societies in self-ratings ofproblems, personal strengths, and aspects of adaptive functioning on the Adult Self-Report (ASR) for nonclinical samples of adults ages 18 to 59 in 17 societies (N 10,197). Results indicated considerable consistency across societies regarding meanratings on the ASR problem items. Most effect sizes (ESs) for societal differences inproblem scales were small (2?5%). Hierarchical linear modeling (HLM) analysesindicated that culture clusters and society accounted for small percentages of variancein Internalizing, Externalizing, and Total Problems scores, with most of the variationaccounted for by individual dif…
Moderate-to-vigorous physical activity and personal well-being in European youth soccer players: Invariance of physical activity, global self-esteem …
2013
In this study, findings concerned with the association of self-reported global self-esteem, vitality and athletes' moderate-to-vigorous physical activity (MVPA) in young soccer players and the generalisability of these associations across different European populations are presented. After listwise exclusion of missing cases and the elimination of cases reporting less than a week of intensive physical activity, the sample of this analysis included 6796 athletes from France (N = 974), Greece (N = 1416), Norway (N = 1051), Spain (N = 2175) and England (N = 1180). Results from multi-sample structural equation modelling analyses provided evidence of invariance across countries for factor loadin…
Intentions to drop-out of youth soccer: A test of the basic needs theory among European youth from five countries
2013
Research arising from self-determination theory (SDT; Deci, E. L., & Ryan, R. M. (2000). The “what” and “why” of goal pursuits: Human needs and the self-determination of behavior. Psychological Inquiry, 11(4), 227–268) indicates that the quality of the social interactions between athletes and coaches, and athletes' ensuing psychological responses, are critical determinants of intentions to drop out of youth sport. Little is known regarding whether these processes hold across countries. Grounded in SDT, this study tested the invariance of a model predicting youth sport dropout across five European countries. Seven thousand seven hundred and sixty-nine grassroots players (6641 males, 1020 fem…