NCSS is a computer program for statistical/data analysis created in 1981. NCSS LLC is the name of the company that produces NCSS. NCSS LLC also produces PASS (Power Analysis and Sample Size) and GESS (Gene Expression Statistical System for Microarray data). NCSS LLC specializes in providing statistical analysis software to researchers, businesses, and academic institutions.

NCSS (originally, Number Cruncher Statistical System) includes over 230 documented statistical and plot procedures. NCSS imports and exports all major spreadsheet, database, and statistical file formats.

Major statistical topics in NCSS

• Analysis of Variance
• Appraisal Methods
• Binary Diagnostic Tests
• Charts and Graphs
• Cross Tabulation
• Curve Fitting
• Descriptive Statistics
• Design of Experiments
• Forecasting
• General Linear Models
• Meta-Analysis
• Mixed Models
• Multivariate
• Proportions
• Quality Control
• Regression Analysis
• Reliability Analysis
• Repeated Measures
• ROC Curves
• Survival Analysis
• Time Series Analysis
• T-Tests