Cox Regression & Survival Analysis Online
✓ Free ✓ Kaplan-Meier curves ✓ Schoenfeld residuals ✓ Fully private
Fit a Cox proportional hazards model on your own time-to-event data, directly in your browser. QuickStats reports hazard ratios with 95% confidence intervals, draws Kaplan-Meier survival curves, tests the proportional hazards assumption with Schoenfeld residuals, and reports model concordance — using R's gold-standard survival package compiled to WebAssembly.
Open the survival analysis tool →How it works
- Upload your dataset (CSV, Excel, Stata, SPSS, SAS) — it needs a follow-up time variable and a two-level event indicator.
- Select the event variable as the outcome, Cox regression as the model, and the time variable — any coding works (0/1, died/alive, yes/no).
- Tick predictors and fit. Hazard ratios, CIs, and p-values appear in a journal-ready table.
- Review plots and diagnostics: forest plot, Kaplan-Meier curve stratified by any predictor, Schoenfeld residual tests, concordance.
What you get
- Hazard ratios (95% CI) with p-values for every predictor
- Kaplan-Meier survival curves with confidence bands, stratified by the variable of your choice
- Proportional hazards testing — per-variable and global Schoenfeld residual tests, flagged when the assumption may be violated
- Concordance (C-statistic) for model discrimination
- Transparent complete-case reporting and an auto-drafted methods paragraph
- Copy-to-Word tables and downloadable PDF/Word reports with embedded figures
Tip: the built-in clinical trial example dataset includes survival outcomes (followup_months, cv_event), so you can try the full survival workflow before uploading your own data.
Frequently asked questions
- What does my dataset need?
- A numeric follow-up time and a two-level event indicator. QuickStats codes the event automatically and names the level it treats as the event.
- Does it check proportional hazards?
- Yes — Schoenfeld residual tests for each predictor and globally, in the Diagnostics tab.
- Can it draw Kaplan-Meier curves?
- Yes, stratified by any predictor, with confidence bands.
- Is my data uploaded?
- No — everything runs in your browser. How the privacy guarantee works.
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