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Showing 1 to 20 of 22 for “"Permutation Tests"”.
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Efficient Moments-Based Permutation Tests: A Framework, Methods and Applications
The key and only assumption for permutation tests is data exchangeability. In real applications, the data exchangeability condition is not always valid. In order to preserve the exchangeability condition required in permutation tests, we propose a new blockwise permutation test approach based on …
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Asymptotically robust permutation tests for two-sample goodness-of-fit testing problems
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-05-01
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Extending sequential pattern analyses for understanding the arrangement of learning events: maximum gaps, conditional associations, and permutation tests
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-12-01
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Methods for Exploring Heterogeneity in Systematic Reviews of Randomized Controlled Trials
… controlled trials, 3. The application of permutation based resampling in meta-regression of multiple covariates. An analysis of 406 RCTs of herbal medicine interventions revealed that these trials are regularly under reporting important aspects of the intervention. Next, the second project …
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Functional Anova Models With Application to Corporate Bonds
… residuals curves. The other approaches were permutation tests with two separate resampling approaches: reassigning labels to all factors at the same time; and reassigning labels to one factor at a time.</p> <p>We carried out a simulation study to investigate the size and power of the proposed …
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Comparative analysis of parametric, nonparametric and permutation methods for differential expression
… technology has resulted in a number of tests being proposed to detect differentials expression. The purpose of study is to compare the parametric, non parametric and permutation tests when applied to microarray data for differential expression analysis. t test (parametric), Mann Whitney …
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Functional Localization of Brain Activity in the Iowa Gambling Task Using Graph-Theoretical Methods
… both task states in addition to rest. However, permutation tests of the SI maps revealed significant differences in the spatial extent of DMN consistency across all three tasks. The future application of both methods for functional localization, and the functional significance of the DMN during …
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Notes towards a place based approach for the development of Southern Mexico
… variables. My analysis finds, through permutation tests, statistically significant evidence of spatial (positive and negative) autocorrelation clusters in these municipios for variables like GDP per capita and poverty rates, among others. This evidence supports the argument to …
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Three Essays on the Interpretability of Random Forests: Methods, Insights, and Innovations
… Defined as the increase in loss after the random permutation of a covariate, permutation variable importance makes it possible to rank the covariates by importance, but in the absence of a threshold, the distinction between important and unimportant covariates is inherently arbitrary. We show that …
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Land-Use Changes in Southwestern Guatemala: Assessment of their Effects and Sustainability
… This finding is supported by the results of permutation tests and variability trend analysis, which are well suited for testing non-parametric data, a characteristic of the data of this study area. Water quality, especially values of chloride, arsenic, nitrites, and nitrates, is also of …
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Radiomics of Nsclc: Quantitative Ct Image Feature Characterization and Tumor Shrinkage Prediction
… used to predict shrinkage. Cross validation and permutation tests were used to validate the results. The optimal model gave a strong correlation between the observed and predicted shrinkages with .</p> <p>The second objective of this work was to identify sets of NSCLC CT image features that are …
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Evaluation and assignment of significance levels to peptide identifications from the database search programs using resampling approach
A novel application of Monte Carlo permutation testing that improves the calculation of the peptide match significance levels and detection rate in database search programs is demonstrated. Novel k-permuted decoy databases (where k denotes the type and number of permutations) were evaluated for …
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Improving reproducibility and standards in quantitative N-Glycoproteomic data
… glycosylation sites. RAMZIS uses a series of permutation tests with a weighted Tanimoto similarity assessment, it provides researchers with information on their ability to use their data, the presence of outliers, the probable differentiability of glycosylation sites, and how to improve their …
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Integration of HIV care and family planning: attitudes,challenges and opportunities in Lusaka,Zambia
… FP services were examined using Fisher's exact tests and permutation tests. Most participants (80%) indicated that they intended to use FP methods if made available. However, the majority of them (68%) indicated condoms as a preferred FP method for men, and 80% of them indicated that injectable …
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Integration of HIV care and family planning: attitudes,challenges and opportunities in Lusaka,Zambia
… FP services were examined using Fisher's exact tests and permutation tests. Most participants (80%) indicated that they intended to use FP methods if made available. However, the majority of them (68%) indicated condoms as a preferred FP method for men, and 80% of them indicated that injectable …
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Assessment of the influence of Nonstationary Climate on Extreme Hydrology of Southwestern Canada
… risk. Using Spearman’s rank correlation ρ and permutation tests on quantile-quantile plots, I found that higher magnitude floods are more likely during the negative phase of the PDO than during the positive phase. In addition, the flood frequency analysis (FFA) stratified according to PDO phase …
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Biogeography and potential factors regulating shallow subtidal reef communities in the western Indian Ocean
… were recognised, based on similarity profile permutation tests. Most reefs in the Subtropical Natal Bioregion were dominated by a community type characterised by a high biomass of the filter-feeding ascidian Pyura stolonifera and various species of articulated coralline algae. In the Delagoa …
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Statistical inference for high-dimensional data
… [Gretton et al. (2008)] and related independence tests under the high dimensional scenario. We show that the sample distance/Hilbert-Schmidt covariance between two random vectors can be approximated by the sum of squared componentwise sample cross-covariances up to an asymptotically constant …
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From single species to mesocosms: responses of freshwater copepods and their community to PCP
The results of single species toxicity tests were compared to tests at higher levels of biological organisation. Laboratory single species acute and chronic toxicity tests using three freshwater copepod species: Calamoecia lucasi, Boeckella delicata, and Mesocyclops cf. leuckarti, were compared to …
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Coupled Correlates of Attention and Consciousness
… We developed non-parametric cluster-based permutation tests to infer statistical significance while minimizing the false-positive rate. In the attention experiment, we used the location of cued spatial stimuli and reaction time (RT) as markers of attention. We defined stimulus-related and …
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