Permutation Tests
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Structural differences in mammal assemblages between savanna ecosystems of the Colombian Llanos
Abstract The Colombian Orinoquia region is characterized by a high diversity of mammals, which is associated with complex ecosystems that include large extensions of Neotropical savannas (known locally as “Llanos Orientales”). Despite accelerated anthropogenic transformations in savanna ecosystems, the knowledge to design effective conservation strategie
Pap. Avulsos Zool.. Publicado em: 20/05/2019
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2. Management efficiency to control two invasive grasses in cerrado fragments, in São Paulo State / Eficiência do manejo no controle de duas espécies de gramíneas invasoras em Cerrados Paulistas
Several African grasses introduced in the Brazilian savannas for cattle feeding became invasive, and now they severely threaten the native biodiversity. It is, therefore, fundamental to look for effective methods to control them. The objective of this study was to evaluate the efficiency and cost of different management techniques to control the invasive gra
Publicado em: 2009
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3. Testes de permutaÃÃo e bootstrap em anÃlise estatÃstica de formas: aplicaÃÃes à zoologia
O objetivo desta dissertaÃÃo à aplicar mÃtodos de anÃlise estatÃstica de formas a um problema real da zoologia. Quatro testes foram considerados: T2 de Hotelling, de Goodall, o teste com a estatÃstica de James e o teste com a estatÃstica λ. Estes dois Ãltimos testes nÃo sÃo usados com freqÃÃncia na literatura estatÃstica. TambÃm foram con
Publicado em: 2008
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4. Extração de atributos de forma e seleção de atributos usando algoritmos genéticos para a classificação de regiões / Shape feature extraction and feature selection using genetic algorithm for region classification
Discrimination power of earth surface targets has been continuously bettered with the increasing remote sensors technological advances. Urban systems applications are one of the areas that recently took benefit of these advances, particularly when using high resolution remote sensing data. In this scale, however, it is often necessary to take into account th
Publicado em: 2007
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5. Testing for differentially expressed genes with microarray data
This paper compares the type I error and power of the one- and two-sample t-tests, and the one- and two-sample permutation tests for detecting differences in gene expression between two microarray samples with replicates using Monte Carlo simulations. When data are generated from a normal distribution, type I errors and powers of the one-sample parametric t-
Oxford University Press.
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6. Two-part permutation tests for DNA methylation and microarray data
BioMed Central.
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7. Permutation Tests for Multiple Loci Affecting a Quantitative Character
The problem of detecting minor quantitative trait loci (QTL) responsible for genetic variation not explained by major QTL is of importance in the complete dissection of quantitative characters. Two extensions of the permutation-based method for estimating empirical threshold values are presented. These methods, the conditional empirical threshold (CET) and t
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8. Using scientific evidence to improve hospital library services: Southern Chapter/Medical Library Association journal usage study.
BACKGROUND: Journal usage studies, which are useful for budget management and for evaluating collection performance relative to library use, have generally described a single library or subject discipline. The Southern Chapter/Medical Library Association (SC/MLA) study has examined journal usage at the aggregate data level with the long-term goal of developi
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9. The Power of Association Studies to Detect the Contribution of Candidate Genetic Loci to Variation in Complex Traits
The statistical power of five association study test statistics (two haplotype-based tests, two marker-based tests, and the Transmission Disequilibrium Test–Q5) to detect single nucleotide polymorphism (SNP)/phenotype associations in a linkage–disequilibrium-based candidate gene scan employing a number of SNPs is examined. Power is estimated as a functio
Cold Spring Harbor Laboratory Press.
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10. Scan statistics to scan markers for susceptibility genes
Scan statistics are applied to combine information on multiple contiguous genetic markers used in a genome screen for susceptibility loci. This information may be, for example, allele sharing proportions for sib pairs or logarithm of odds (lod) scores in general small families. We focus on a dichotomous outcome variable, for example, case and control individ
The National Academy of Sciences.
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11. The Fingerprint of Phantom Mutations in Mitochondrial DNA Data
Phantom mutations are systematic artifacts generated in the course of the sequencing process itself. In sequenced mitochondrial DNA (mtDNA), they generate a hotspot pattern quite different from that of natural mutations in the cell. To identify the telltale patterns of a particular phantom mutation process, one first filters out the well-established frequent
The American Society of Human Genetics.
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12. Ethnohistory, genetics, and cancer mortality in Europeans
Geographic variation in cancer rates is thought to be the result of two major factors: environmental agents varying spatially and the attributes, genetic or cultural, of the populations inhabiting the areas studied. These attributes in turn result from the history of the populations in question. We had previously constructed an ethnohistorical database for E
The National Academy of Sciences of the USA.