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.

 

 

 

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