NCSS是美国NCSS公司的产品。该公司自从1981年开始致力于统计分析软件的开发，已经先后推出了适合于Win3.1环境的NCSS6.0和适合于Win9x/NT系统的NCSS97和NCSS2000。NCSS在国外有着重要影响，一些使用者对它作出了高度评价，认为是“自己15年来使用的统计软件中最容易上手的系统”。NCSS目前的最新版本为NCSS2004版本。NCSS for Windows是又一款小巧而优秀的统计分析软件，其界面友好，功能齐全，可以进行描述性统计、相关及回归分析、试验设计、质量控制、生存及可靠性分析、多元分析、时间序列分析及预测、统计图表绘制等操作。



PASS
Power Analysis and Sample Size
The Best Power Analysis Software on the Market

Power Analysis
A statistical test's power is the probability that the test procedure will result in statistical significance. Power is related to the sample size, the size of the type I (alpha) error, the actual size of the effect, and the size of experimental error. All of these must be considered in order to calculate statistical power.

PASS is a standalone system. Although it is integrated with NCSS, you do not have to own NCSS to run it. You can use it with any statistical software you want. PASS runs under Windows Vista, XP, 2000, NT, ME, 98, and 95.

PASS is accurate. It has been extensively verified using books and reference articles. Proof of the accuracy of each procedure is included in the extensive documentation.

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