How many subjects? Statistical power analysis in research
نویسندگان
چکیده
منابع مشابه
How Many Are Enough? Statistical Power Analysis and Sample Size Estimation in Clinical Research
One of the most common questions asked of statisticians is, “How many are enough?” The answer to that question, unfortunately, is complex, and only part of it can be answered by the statistician. This is because power calculation is part mathematical calculation and part judgment call. The former requires knowledge about population characteristics; the latter requires choices about tolerable er...
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اندیشمندان و صاحب نظران علوم اجتماعی بر این باورند که مرحله تازه ای در تاریخ جوامع بشری اغاز شده است. ویژگیهای این جامعه نو را می توان پدیده هایی از جمله اقتصاد اطلاعاتی جهانی ، هندسه متغیر شبکه ای، فرهنگ مجاز واقعی ، توسعه حیرت انگیز فناوری های دیجیتال، خدمات پیوسته و نیز فشردگی زمان و مکان برشمرد. از سوی دیگر قدرت به عنوان موضوع اصلی علم سیاست جایگاه مهمی در روابط انسانی دارد، قدرت و بازتولید...
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Statistical power analysis can be used to increase the efficiency of research efforts and to clarify research results. Power analysis is most valuable in the design or planning phases of research efforts. Such prospective (a priori) power analyses can be used to guide research design and to estimate the number of samples necessary to achieve a high probability of detecting biologically signific...
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One of the most frequently cited reasons for conducting a meta-analysis is the increase in statistical power that it affords a reviewer. This article demonstrates that fixed-effects meta-analysis increases statistical power by reducing the standard error of the weighted average effect size (T.) and, in so doing, shrinks the confidence interval around T.. Small confidence intervals make it more ...
متن کاملHow many subjects constitute a study?
In fMRI there are two classes of inference: one aims to make a comment about the "typical" characteristics of a population, and the other about "average" characteristics. The first pertains to studies of normal subjects that try to identify some qualitative aspect of normal functional anatomy. The second class necessarily applies to clinical neuroscience studies that want to make an inference a...
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ژورنال
عنوان ژورنال: Behavior Research Methods, Instruments, & Computers
سال: 1990
ISSN: 0743-3808,1532-5970
DOI: 10.3758/bf03203200