Results 31 to 40 of about 8,421,143 (315)
Sample- and segment-size specific Model Selection in Mixture Regression Analysis [PDF]
, 2006 As mixture regression models increasingly receive attention from both theory and practice, the question of selecting the correct number of segments gains urgency.
Sarstedt, Marko
core +2 more sources
A systematic review of the “promising zone” design
Trials, 2020 Introduction Sample size calculations require assumptions regarding treatment response and variability. Incorrect assumptions can result in under- or overpowered trials, posing ethical concerns.
Julia M. Edwards +3 more
doaj +1 more source
Collabra: Psychology, 2021 An important step when designing an empirical study is to justify the sample size that will be collected. The key aim of a sample size justification for such studies is to explain how the collected data is expected to provide valuable information given the inferential goals of the researcher.
openaire +3 more sources
The unpredictably eruptive dynamics of spruce budworm populations in eastern Canada
Population Ecology, EarlyView.We examine historical population data for spruce budworm from several locations through the period 1930–1997, and use density‐dependent recruitment curves to test whether the pattern of population growth over time is more consistent with Royama's (1984; Ecological Monographs 54:429–462) linear R(t) model of harmonic oscillation at Green River New ...
Barry J. Cooke, Jacques Régnière
wiley +1 more source
Sample size estimation in research: Necessity or compromise?
Kerala Journal of PsychiatryAn adequately powered sample is essential for accurate parameter estimation and meaningful significance testing. It is important to balance sample size with practical considerations such as cost and feasibility.
Samir Kumar Praharaj, Shahul Ameen
doaj +1 more source
Sample Size Considerations for Hierarchical Populations [PDF]
EFSA Journal, 2013 In applied sciences in general, and in particular when dealing with animal health and welfare assessments, one is often confronted with the collection of correlated data (not independent data).
European Food Safety Authority
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Network topology drives population temporal variability in experimental habitat networks
Population Ecology, EarlyView.Habitat patches connected by dispersal pathways form habitat networks. We explored how network topology affects population outcomes in laboratory experiments using a model species (Daphnia carinata). Central habitat nodes in complex lattice networks exhibited lower temporal variability in population sizes, suggesting they support more stable ...
Yiwen Xu +3 more
wiley +1 more source
Geographic variation in walking activity in the red flour beetle Tribolium castaneum
Population Ecology, EarlyView.This study examined whether there is geographic variation in field populations, focusing on the moving activity in the red flour beetle Tribolium castaneum. Results showed significant differences in moving activity among field populations but no correlation with latitude or meteorological factors.
Kentarou Matsumura
wiley +1 more source
Improved bounds on sample size for implicit matrix trace estimators
, 2014 This article is concerned with Monte-Carlo methods for the estimation of the trace of an implicitly given matrix $A$ whose information is only available through matrix-vector products. Such a method approximates the trace by an average of $N$ expressions
Ascher, Uri, Roosta-Khorasani, Farbod
core +1 more source
Sample size calculations for indirect standardization
BMC Medical Research Methodology, 2023 Indirect standardization, and its associated parameter the standardized incidence ratio, is a commonly-used tool in hospital profiling for comparing the incidence of negative outcomes between an index hospital and a larger population of reference ...
Yifei Wang, Philip Chu
doaj +1 more source