WhichDist
Which distribution fits your data?
A modern Microsoft Excel add-in for guided input analysis. Select a numeric range, answer a few questions, and WhichDist fits candidate distributions, ranks them with an AICc-led composite (always showing Anderson–Darling and Kolmogorov–Smirnov), and proves the recommendation with histogram, ECDF, and Q–Q plots — fully offline.
📥 — downloads and counting
See it in action
The task pane guides you from a selection to a proven recommendation — descriptive stats, a short wizard, ranked fits, and proof plots.
Built for engineers and technical students
Guided nature wizard
Answer questions about your data's nature and engineering discipline; WhichDist forms a candidate set with a clear Candidate Policy.
Rigorous ranking
AICc-led composite ranking, with Anderson–Darling and Kolmogorov–Smirnov statistics always shown. Best supported among candidates — never a claim of absolute truth.
Proof plots
Histogram with fitted PDF, empirical vs. fitted CDF, and Q–Q plots — ready for your lab report.
Offline & private
Free analysis runs entirely inside Excel. Your sample data is never uploaded.
Why WhichDist instead of a separate tool?
Input analysis and descriptive statistics where your data already lives — a free, friendlier alternative to Arena Input Analyzer and similar tools, with nothing to export.
Free & capable
A broad distribution catalog with AICc-led ranking and full goodness-of-fit — no licence fee, and more families than the classic input analyzers.
Stats + fit in one place
Descriptive statistics and the best-fitting distribution together, so you go from raw numbers to a defensible model in one pass.
Right inside Excel
No moving data into Arena, Minitab, or other third-party apps — analyze it where it already is and write results back to the sheet.
Friendly & guided
A short wizard, plain-language guidance on the tests and plots, and Turkish plus five other languages — approachable for students and practitioners alike.
What people say
From engineers and students using WhichDist for input analysis.
Same family
WhichDist and WhichForecast are sister Excel add-ins from NCU Technology. Same guided style, different job.
WhichDist
Which distribution fits your data? Guided input analysis, AICc-led ranking, and proof plots — this site.
WhichForecast
Which forecast fits your data? Time-series fingerprint, method match, rolling-origin MASE — inside Excel.
Have feedback?
Tell us what works and what doesn’t — it shapes what we build next.