Σ Statistical Methods (StatsVinai)

Data entry, cleaning, tests, regression and graphs in one desktop app. No coding needed.

Open an Excel (.xlsx, .xls), .csv, or .txt file, or type your own data into an Excel-like table. Pick an analysis from a menu, answer a short dialog, and read the result in plain language with a clear statistical decision line.

Data Entry & Cleaning

• Spreadsheet-style typing with 8 validated data types (integer, decimal, date, category, etc.)
• Quality checks: profile reports, missing-data map, outliers, duplicates, and text consistency
• 12 imputation methods (mean, median, KNN, regression)
• Transformations: Log, Box-Cox, z-score, bins, dummies, lags & computed columns
• Reshape & combine: merge, append, pivot, group-by, melt, and 20-step undo

Descriptive & Inference Analysis

• Summary statistics with skewness, kurtosis, group-wise summaries & frequency tables
• Pearson, Spearman, and Kendall correlations with heat maps
• One-sample, Student, Welch, Paired t-tests, Mann-Whitney & Wilcoxon tests
• ANOVA with Tukey post-hoc, Kruskal-Wallis, Chi-square & normality tests
• Clear decision line on every test: significant (green) or not significant (orange)

13 Regression Tools

• 7 Linear Models: Simple, Multiple, Polynomial, Stepwise (AIC/BIC), Ridge, Lasso, Elastic Net, Robust & Quantile
• 5 Generalized Models: Logistic, Probit, Multinomial Logistic, Poisson, and Negative Binomial (with Odds Ratios, ROC & AUC)
• Nonlinear Curves: Compares 8 curve families (Exponential, Power, Logistic, Gaussian, Michaelis-Menten) ranked by AIC

25 Interactive Graph Types & Export

• Distribution (8): Histogram, density, ECDF, Q-Q, box, violin, strip
• Categorical (6): Bar, pie, donut, Pareto, stacked, cross-tab heat map
• Relationships (7): Scatter, regression band, bubble, hexbin, matrix, 3-D
• Trends (4): Line, area, moving average, control chart
• Zoom, pan, and save graphs; export reports to Excel (live cells), Word, PDF, or Text