统计分析软件NCSS 2020已正式发布
NCSS 2020是统计分析和图形软件当前的新版本。NCSS 2020中的新的分组序列分析程序，在PASS 2020中有相应的分组序列功效和样本量程序。
New Procedures in NCSS 2020
random Sampling
Simple Random Sampling
Stratified Rondom Sampling
Simple Random Sampling with Group Assignment
Steatified Rondom Sampling Input Example
Group-Sequential Tests（Futility Boundary Options, Sample Size Re-estimation）
For each of these group-sequential analysis and sample-size re-estimation procedures, these are corresponding group-sequential power and sample size procedures in PASS 2020
Group-Sequential Analysis for Two Hazard Rates
Group-Sequential Non-Inferiority Analysis for Two Hazard Rates
Group-Sequential Superiority by a Margin Analysis for Two Hazard Rates
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Group-Sequential Non-Inferiority Analysis for Two Means with Known Variance
Group-Sequential Superiority by a Margin Analysis for Two Means with Known Variance
Group-Sequential Non-Inferiority T-Tests for Two Means
Group-Sequential Superiority by a Margin T-Tests for Two Means
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Group-Sequential Non-Inferiority Analysis for Two Proportions
Group-Sequential Superiority by a Margin Analysis for Two Proportions
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Group-Sequential Analysis for One Means with Known Variance
Group-Sequential T-Tests for One Means
Group-Sequential Analysis Input Example
Group-Sequential Analysis Input Example
Sample Size Re-Estimation Output Example
Updated and/or Improved Procedures in NCSS 2020
These Procedures have been updated to improve funcitionality and flexibility
At-Risk Tables in Survival/Reliability Procedures
For each of these procedures, at-risk tables were added to the survival-type plots. Additional input and output improvements were also made.
Kaplan-Meier Curves（Logrank Tests）
Life-Table Analysis
Cumulative Incidence
Gamma Distribution Fitting
Beta Distribution Fitting
Distribution（Weibull）Fitting
At-Risk Table Example
Heatmaps in Factor Analysis and PCA procedures
Visual interpretation was improved in these procedures by adding heatmaps to the output. Additional examples were added as well.
Factor Analysis
Principal Components Analysis
Heatmap Example
Contingency Tables（Crosstabs/Chi-Square Test）
In the Contingency Tables（Crosstabs/Chi-Seqare Tests）procedure, the Tukey-Pairwise and Dunnett's Many-to-one（Control）multiple comparisons results were added. These include the adjustments suggested by Agresti and Caffo（2000）.Both p-values and Confidence limits for Wald and Score tests are now included.
Randomization Lists
A variety of improvements were made to the Randomization Lists procedure, including block randomization, the option of specifying a random seed, group titles, sample size entry options, and strata specification.
Enhancements
Menory
A major memory performance enhancement was integrated into the spreadsheet, resulting in up to a 70% decrease in required memory.
Standardized Range Distribution
Improved algorithms for the Standardized Range Probability were integrated, to improve accuracy.
Compatibility
NCSS 2020 is fully compatible with Windows 10, 8.1, 8, 7, and Vista SP2, on both 32-bit and 64-bit operating systems.
