The series vary in length (68 to 144 observations) and include seasonal, non-seasonal, and "difficult" patterns with outliers and structural breaks. Key Strengths
The historical data is typically provided in vertical columns of varying lengths. nn3.zip
Includes a wide range of real-world business patterns (e.g., industry data), making it a robust test for model generalization. The series vary in length (68 to 144
It is a standard historical benchmark in the forecasting community and is often included in modern research packages like the tscompdata R package on GitHub. nn3.zip