Results 21 to 30 of about 3,789,491 (216)
Ciência Rural, 1996 Com base em resultados de experimentos conduzidos nos anos agrícolas de 1991/92 e 1992/93 no Departamento de Fitotecnia da Universidade Federal de Santa Maria com as cultivares de feijoeiro Iraí e Macanudo, calculou-se o tamanho da amostra necessário ...
Valduíno Estefanel +2 more
doaj +1 more source
Published correlational effect sizes in social and developmental psychology
Royal Society Open Science, 2022 The distribution of effect sizes may offer insights about the research done and reported in a scientific field. We have evaluated 12 412 manually collected correlation effect sizes (Sample 1) and 31 157 computer-extracted correlation effect sizes (Sample
Josefína Weinerová +2 more
doaj +1 more source
Concepts in sample size determination
Indian Journal of Dental Research, 2012 Investigators involved in clinical, epidemiological or translational research, have the drive to publish their results so that they can extrapolate their findings to the population.
Umadevi K Rao
doaj +1 more source
Methodological considerations for the design and implementation of reliable and valid web surveys
Public Health and Toxicology, 2021 This article examines practical epidemiology principles related to the design and implementation of web surveys. Six practice-oriented items are critically examined: 1) The study question; 2) The target population; 3) Study population needed; 4) Sampling
Israel Agaku
doaj +1 more source
Sample size calculation: Basic principles
Indian Journal of Anaesthesia, 2016 Addressing a sample size is a practical issue that has to be solved during planning and designing stage of the study. The aim of any clinical research is to detect the actual difference between two groups (power) and to provide an estimate of the ...
Sabyasachi Das +2 more
doaj +1 more source
Small sample sizes in the study of ontogenetic allometry; implications for palaeobiology [PDF]
PeerJ, 2015 Quantitative morphometric analyses, particularly ontogenetic allometry, are common methods used in quantifying shape, and changes therein, in both extinct and extant organisms.
Caleb Marshall Brown, Matthew J. Vavrek
doaj +2 more sources
Tips for troublesome sample-size calculation [PDF]
Korean Journal of Anesthesiology, 2020 Properly set sample size is one of the important factors for scientific and persuasive research. The sample size that can guarantee both clinically significant differences and adequate power in the phenomena of interest to the investigator, without ...
Junyong In +7 more
doaj +3 more sources
A review of Bayesian perspectives on sample size derivation for confirmatory trials [PDF]
Am. Stat., 2021, 75(4), 424--432, 2020 Sample size derivation is a crucial element of the planning phase of any confirmatory trial. A sample size is typically derived based on constraints on the maximal acceptable type I error rate and a minimal desired power. Here, power depends on the unknown true effect size.
arxiv +1 more source
American Journal of Epidemiology, 2005 The belief is widespread that studies are unethical if their sample size is not large enough to ensure adequate power. The authors examine how sample size influences the balance that determines the ethical acceptability of a study: the balance between the burdens that participants accept and the clinical or scientific value that a study can be expected
Bacchetti, Peter +3 more
openaire +2 more sources
A noniterative sample size procedure for tests based on t distributions [PDF]
Statistics in medicine 2018, 2018 A noniterative sample size procedure is proposed for a general hypothesis test based on the t distribution by modifying and extending Guenther's (1981) approach for the one sample and two sample t tests. The generalized procedure is employed to determine the sample size for treatment comparisons using the analysis of covariance (ANCOVA) and the mixed ...
arxiv +1 more source