Results 31 to 40 of about 3,879,175 (152)
Epidemiology, Biostatistics and Public Health, 2023 The rate of phase III trials failures is approximately 42-45%, and most of them are due to a lack of efficacy. Some of the failures for a lack of efficacy are expected, due to type I errors in phase II and type II errors in phase III.
Daniele De Martini
doaj +1 more source
Basic Statistical Concepts for Sample Size Estimation
Indian Journal of Anaesthesia, 2008 For grant proposals the investigator has to include an estimation of sample size .The size of the sample should be adequate enough so that there is sufficient data to reliably answer the research question being addressed by the study.
Vithal K Dhulkhed +4 more
doaj
Basic principles of sample size calculation
Journal of the Practice of Cardiovascular Sciences, 2020 The calculation of sample size helps a medical researcher to assess cost, time, and feasibility of his project besides scientific justification and validity. Although frequently reported in journals, the details or the elements of sample size calculation
Shivam Pandey
doaj +1 more source
Lower bounds for the expected sample size in the classical and d-posterior statistical problems
Учёные записки Казанского университета: Серия Физико-математические науки, 2018 In this report, the problem of construction of lower boundaries for the expected sample size of statistical inference procedures has been considered. The general methodology for construction of the lower bounds and the review of the main results for the ...
I.A. Kareev, I.N. Volodin
doaj
How sample size influences research outcomes
Dental Press Journal of Orthodontics, 2014 Sample size calculation is part of the early stages of conducting an epidemiological, clinical or lab study. In preparing a scientific paper, there are ethical and methodological indications for its use.
Jorge Faber, Lilian Martins Fonseca
doaj +1 more source
Essentials of sample size calculation
Current Medicine Research and Practice, 2013 Some essential information is required before the sample size of a study can be calculated. Choosing a study design is the first step. Next, we need to know the type of parameters of interest, inter-individual variability, precision, chance of errors ...
Anita Singh, Arun Soni, Satish Saluja
doaj
Two Measures for Sample Size Determination
Survey Research Methods, 2011 Social surveys often must estimate the sizes or the proportions of many small groups and differences among them. The discussion of the needed precision of the estimators and the corresponding sample size is difficult, in particular when lay persons are ...
Philippe Eichenberger +2 more
doaj +1 more source
Principles of sample size calculation
Indian Journal of Ophthalmology, 2010 In most areas in life, it is difficult to work with populations and hence researchers work with samples. The calculation of the sample size needed depends on the data type and distribution.
Gogtay Nithya
doaj
Sample size analysis for conducting research [PDF]
ITM Web of ConferencesThe paper describes a method for analyzing a sample size for conducting research. The main stages of sample size analysis with different error rates are considered. The stages of the work in the software for calculating the error rate and sample size are
Pokushko Mariia +5 more
doaj +1 more source