| RMSE between actual sales data and model forecast | Seeding acceleration effect-Peak shift (years) | ||
Market | 2-stage | 4-stage | 2-stage | 4-stage |
PC | 11.05 | 9.47 | 5 | 3 |
iPod | 5792.3 | 2164.8 | 2 | 0 |
RP | 5835.3 | 321.5 | 12 | 3 |