CSV Forecast
Drop a CSV with a date and a number and get a backtested time-series forecast with 80% and 95% prediction intervals. Detects frequency and seasonality, fits Holt-Winters (additive and multiplicative), STL + exponential smoothing and a seasonal-naive baseline, scores them with MAPE, MASE and interval coverage, and exports the forecast CSV. Free, no sign-in; everything runs in your browser.
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