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 Power and Precision   - 效能分析软件
Power and Precision 是一个独立的统计效能分析软件包,用于计划研究的样本容量大小的计算。本软件提供一个清晰的界面,以及许多工具,以帮助用户理解效能分析。它将创建表格,图形,和报告都集成到了一个单击中。
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Power Analysis
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Traditionally, data collected in a research study is submitted to a significance test to assess the viability of the null hypothesis. The p-value provided by the significance test, and used to reject the null hypothesis, is a function of three factors: The larger the observed effect, the larger the sample size, and/or the more liberal the criterion required for significance (alpha ), the more likely it is that the test will yield a significant p-value.
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A power analysis, executed when the study is being planned, is used to anticipate the likelihood that the study will yield a significant effect and is based on the same factors as the significance test itself. Specifically, the larger the effect size used in the power analysis, the larger the sample size, and/or the more liberal the criterion required for significance (alpha), the higher the expectation that the study will yield a statistically significant effect.
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These three factors, together with power, form a closed system - once any three are established, the fourth is completely determined. The goal of a power analysis is to find an appropriate balance among these factors by taking into account the substantive goals of the study, and the resources available to the researcher.
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Power and Precision 中国代理

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Work interactively!
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Interactive guide walks you through all the steps in the power analysis
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Modify any element in the study and immediately see the impact on power
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Use a wide array of tools to visualize the effect size and to understand the impact of alpha, effect size, and sample size
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Power and Precision 中国代理

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Create A Report with a Single Click!
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The program generates a lucid, comprehensive report that explains the study design, assumptions, and power.
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The report serves as a teaching tool and may also be used in the statistics section of a study proposal or grant application
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Export to Word™ or other word processing program.
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Create Tables and Graphs with a Single Click!
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Get the big picture in just seconds! Use graphs to quickly evaluate any number of options for study design.
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Export to Word™, Excel™, PowerPoint™ and other programs.
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Include the graphs in your presentation or grant application to justify your selection of a sample size.
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Power and Precision 中国代理
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