Results 1 to 10 of about 1,709,075 (283)

Two-Step Sequential Sampling for Gamma Distributions [PDF]

open access: yes
estimation bias;extended sampling;sample extension;stochastic sample size;two-step sampling;statistical ...
Moors, J.J.A., Strijbosch, L.W.G.
core   +1 more source

Using causal diagrams and superpopulation models to correct geographic biases in biodiversity monitoring data

open access: yesMethods in Ecology and Evolution
Biodiversity monitoring schemes periodically measure species' abundances and distributions at a sample of sites to understand how they have changed over time. Often, the aim is to infer change in an average sense across some wider landscape. Inference to
Robin J. Boyd   +7 more
doaj   +1 more source

Propensity Score Matching in Non-Interventional Studies: A Step-by-Step Guide for Clinicians and Researchers [PDF]

open access: yesIranian Journal of Medical Sciences
Selection bias occurs when a study’s sample is not representative of the entire population, which can lead to incorrect conclusions.
Saeedeh Pourahmad, Farzan Madadizadeh
doaj   +1 more source

Sample-Selection Bias

open access: yesCapitalism: A Journal of History and Economics
Abstract: Sample-selection bias (SSB) arises when the process that selects observations into a sample involves a correlation with the question of interest. SSB affects many quantitative historical sources and has analogues in other forms of historical inquiry.
openaire   +1 more source

Sampling Bias in the Molecular Epidemiology of Tuberculosis

open access: yesEmerging Infectious Diseases, 2002
Among the goals of the molecular epidemiology of infectious disease are to quantify the extent of ongoing transmission of infectious agents and to identify host- and strain-specific risk factors for disease spread.
Megan B. Murray
doaj   +1 more source

Spatial close‐kin mark‐recapture models applied to terrestrial species with continuous natal dispersal

open access: yesMethods in Ecology and Evolution
Close‐kin mark–recapture (CKMR) methods use information on genetic relatedness among individuals to estimate demographic parameters. An individual's genotype can be considered a ‘recapture’ of each of its parent's genotype, and the frequency of kin‐pair ...
Anthony Sévêque   +3 more
doaj   +1 more source

iNaturalist Users Exhibit Distinct Spatiotemporal Sampling Preferences, with Implications for Biodiversity Science and Project Planning

open access: yesCitizen Science: Theory and Practice
Biodiversity-focused contributory science platforms generate massive quantities of opportunistic records for research, but data are spatially, temporally, and taxonomically biased. While research attempting to quantify these biases abounds, less is known
Erin L. Grady   +3 more
doaj   +1 more source

sample bias

open access: yes
Citation: 'sample bias' in the IUPAC Compendium of Chemical Terminology, 5th ed.; International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.09279 • License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International for individual terms ...
openaire   +1 more source

Sample bias may obscure results [PDF]

open access: yesBritish Journal of Psychiatry, 2010
Di Forti et al [1][1] present their paper as further evidence of the link between high-potency cannabis and psychosis. Obviously, a major issue in case–control studies is the sampling, and any difference between case and control groups needs to be carefully considered. The authors state that ‘
openaire   +1 more source

Non-response and population representation in studies of adolescent time use [PDF]

open access: yes
Researchers have debated which methods are most valid and reliable for studying time use. One key instrument for measuring time use is the time diary, which has unique analytic properties that, if not adjusted for, can bias estimates.
Barbara Schneider   +2 more
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