Survival Analysis

Breslow Test formula, assumptions, weighted risk-set calculation, verified 649-row example, interpretation, Python, R, SPSS, Excel, charts and downloads.

Cox Regression Assumptions explained with proportional-hazards checks, residual diagnostics, functional-form review, verified results and software workflows.

Cox Proportional Hazards Regression formula, assumptions, adjusted hazard ratios, verified results, diagnostics, Python, R, SPSS, Excel and downloads.

Competing Risks Analysis with cumulative incidence formulas, event-type coding, a verified 649-row example, Python, R, SPSS, Excel, diagnostics and downloads.

Exponential Survival Model formula, constant-hazard assumption, censored likelihood, verified parameters, diagnostics, Python, R, SPSS and Excel workflows.

Cumulative Hazard Function formula, Nelson–Aalen calculation, relation to survival, verified values, interpretation, Python, R, SPSS, Excel and charts.

Hazard Ratio formula, reference-group meaning, confidence interval, proportional-hazards limits, verified Cox results, software workflows, charts and downloads.

Fine Gray Model formula, subdistribution hazard ratio interpretation, competing-event coding, verified results, diagnostics, software workflows and downloads.

Fleming Harrington Test formula, rho and gamma weights, verified weighted log-rank result, assumptions, Python, R, SPSS, Excel, charts and downloads.

Life Table Analysis formulas for grouped survival, interval risk, withdrawal adjustment and hazard, with verified results, software workflows and downloads.