Results 291 to 300 of about 4,058,415 (318)
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Statistical Power in Psychiatric Research
Australian & New Zealand Journal of Psychiatry, 1986Statistical power is neglected in much psychiatric research, with the consequence that many studies do not provide a reasonable chance of detecting differences between groups if they exist in the population. This paper attempts to improve current practice by providing an introduction to the essential quantities required for performing a power analysis
Bird, Kevin D., Hall, Wayne
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International Journal of Injury Control and Safety Promotion, 2014
When planning a research study, the issue of the necessary sample size is one that is extremely important.
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When planning a research study, the issue of the necessary sample size is one that is extremely important.
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Pediatrics, 1987
To the Editor.— Dr Donowitz described an interesting research project in which the efficacy of overgown use in the prevention of pediatric intensive care unit nosocomial infection was examined.1 He concludes that "overgowns were an expensive and ineffective method of preventing or decreasing nosocomial infections."1 Although Dr Donowitz ...
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To the Editor.— Dr Donowitz described an interesting research project in which the efficacy of overgown use in the prevention of pediatric intensive care unit nosocomial infection was examined.1 He concludes that "overgowns were an expensive and ineffective method of preventing or decreasing nosocomial infections."1 Although Dr Donowitz ...
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The importance of statistical power [PDF]
BMJ, 2013 The effectiveness of a home based early childhood intervention on children’s body mass index (BMI) at age 2 years was investigated. A randomised controlled superiority trial was used. The intervention consisted of eight home visits from specially trained community nurses in the first 24 months after birth.
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2020
In this chapter, we focus on approximation problems motivated by studies on the asymptotic behavior of power-divergence family of statistics. These statistics are the goodness-of-fit test statistics and include, in particular, the Pearson chi-squared statistic, the Freeman–Tukey statistic, and the log-likelihood ratio statistic.
Yasunori Fujikoshi, Vladimir V. Ulyanov
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In this chapter, we focus on approximation problems motivated by studies on the asymptotic behavior of power-divergence family of statistics. These statistics are the goodness-of-fit test statistics and include, in particular, the Pearson chi-squared statistic, the Freeman–Tukey statistic, and the log-likelihood ratio statistic.
Yasunori Fujikoshi, Vladimir V. Ulyanov
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Statistical Power and Sample Size
2000Figure 6.1 shows two graphs of t-distributions. The lower graph (H1) could be a probability distribution of a sample of data or of a sample of paired differences between two observations. N = 20 and so 95% of the observations is within 2.901 ± 2.101 standard errors of the mean (SEMs) on the x-axis (usually called z-axis in statistics).
Toine F. Cleophas +2 more
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Statistical power and analytical quantification
Journal of Chromatography B, 2007It is suggested that power analysis should be formally incorporated into quantification experiment reports in order to substantiate the conclusions derived from experimental data more effectively. The article addressed the issues of power analysis calculation, sample size estimation and appropriate data reporting in quantitative analytical comparisons.
Livar Frøyland, Pedro Araujo
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Powers, Probability and Statistics
2020Regularity is often taken as the starting point of our causal knowledge. But pure constant conjunctions are not what science finds. Even in randomised controlled trials, we do not discover a regular frequency of occurrence of some effect. The dispositionalist is able to explain the evidence of science in terms of the ontology of real causal powers ...
Stephen Mumford +2 more
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Statistics: Discovering Its Power.
Journal of the American Statistical Association, 1983Statistics: Discovering its Power. By T. H. Wonnacott and R. J. Wonnacott. London, Ontario, Wiley, 1982. xviii, 378 p. 24.5 cm. £16.45 (hardbound), £7.20 (paperbound). (Wiley Series in Probability and Mathematical Statistics.)
T. H. Wonnacott +2 more
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Current Directions in Psychological Science, 1992
pression, Journal of Clinical Psychiatry, 51, 61-69 (1990). 11. L.R. Baxter, Jr., J.M. Schwartz, B.H. Guze, J.C. Mazziotta, M.P. Szuba, K. Bergman, A. Alazraki, C.E. Selin, H.K. Freng, P. Munford, and M.E. Phelps, Obsessive-compulsive disorder vs. Tourette's disorder: Differential function in subdivi sions of the neostriatum, paper presented at the an ...
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pression, Journal of Clinical Psychiatry, 51, 61-69 (1990). 11. L.R. Baxter, Jr., J.M. Schwartz, B.H. Guze, J.C. Mazziotta, M.P. Szuba, K. Bergman, A. Alazraki, C.E. Selin, H.K. Freng, P. Munford, and M.E. Phelps, Obsessive-compulsive disorder vs. Tourette's disorder: Differential function in subdivi sions of the neostriatum, paper presented at the an ...
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