Results 41 to 50 of about 1,497,290 (270)
Sample Size Determination to Evaluate the Impact of Highway Improvements [PDF]
, 1989 This paper was prepared for the Department of Transport, as a support document to a main report on the feasibility of measuring responses to highway improvements.
Fowkes, A.S., Watson, S.M.
core
Impact of imperfect test sensitivity on determining risk factors : the case of bovine tuberculosis [PDF]
, 2012 Background Imperfect diagnostic testing reduces the power to detect significant predictors in classical cross-sectional studies. Assuming that the misclassification in diagnosis is random this can be dealt with by increasing the sample size of a study ...
Camille Szmaragd +4 more
core +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
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
Guidelines of the minimum sample size requirements for Kappa agreement test
Epidemiology, Biostatistics and Public Health, 2022 Background and aims: To estimate sample size for Cohen’s kappa agreement test can be challenging especially when it is expected that the true marginal rating frequencies are not the same.
Mohamad Adam Bujang, Nurakmal Baharum
doaj +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
Journal of Anaesthesiology Clinical Pharmacology, 2015 In anesthesia and intensive care, treatment benefits that were claimed on the basis of small or modest-sized trials have repeatedly failed to be confirmed in large randomized controlled trials.
Christian J Wiedermann +1 more
doaj +1 more source
occumb: An R package for site occupancy modeling of eDNA metabarcoding data
Population Ecology, EarlyView.This study introduces a new R package, occumb, for the convenient application of site occupancy modeling using environmental DNA (eDNA) metabarcoding data. We outline a data analysis workflow, including data setup, model fitting, model assessment, and comparison of potential study settings based on model predictions, all of which can be performed using
Keiichi Fukaya, Yuta Hasebe
wiley +1 more source
The Determination of Sample Size
American Journal of Public Health and the Nations Health, 1951 IN the early stages of planning a sample survey one is ordinarily concerned with two different sets of questions, both relating to the survey's feasibility. First of all one is concerned with the possibility of obtaining the required information from the type of respondent considered.
openaire +4 more sources
Accuracy and Precision of Insect Density and Impact Estimates [PDF]
, 2017 In estimating insect density and impact, entomologists are understandably interested in accuracy of estimation, but they almost always are dealing with precision because of bias due to an invalid estimator, probability sampling, or nonsampling errors ...
Fowler, Gary W, Witter, John A
core +2 more sources