Pokémon ETB Forecast Accuracy and Model Limits
A forecast is useful only when its uncertainty is visible. Sealed Value publishes walk-forward results and model limits because a precise-looking line can create false confidence. The model is a best-effort comparison with historical ETBs, not a promise that a future buyer will pay the displayed target.
Current walk-forward results
| Market | 12-month samples | Typical absolute error | Median bias | Displayed range coverage |
|---|---|---|---|---|
| Pokémon Center ETBs | 3 | 33.1% | -1.2% | 66.7% |
| Standard ETBs | 3 | 11.5% | -4.2% | 100% |
| Booster Bundles | 3 | 21.5% | 21.5% | 33.3% |
| Booster Boxes | 1 | 22.2% | -22.2% | 100% |
| Collections | 0 | Not enough history | Not enough history | Not enough history |
Typical absolute error describes the median size of the miss, regardless of direction. Median bias shows whether forecasts tended to land high or low. Range coverage shows how often the realized outcome landed inside the displayed scenario range. None of these metrics guarantees that the next forecast will behave similarly.
Why Pokémon Center error is higher
Exclusive ETBs can have thinner transaction histories, larger premiums, and stronger supply shocks. A small number of unusual releases can produce wide outcomes. The displayed range comes from complete historical peer returns; it does not imply guaranteed coverage or turn sparse data into certainty.
Known failure modes
- Reprints and restocks: unannounced supply can interrupt the historical lifecycle.
- Demand shocks: a new collecting trend can make older averages temporarily irrelevant.
- Thin sales: a market price based on few transactions may not be executable at scale.
- Outlier sets: a unique hit can move far beyond the typical cohort, while a weak set can lag it.
- Costs: decision ROI includes a 15% selling-cost allowance but excludes shipping, taxes, storage, damage, and the value of time.
- Product mismatch: each forecast applies only to the exact product family selected; it does not predict cards or the full set.
How Sealed Value avoids overstating confidence
New products can show provisional forecasts when five complete same-class historical paths support the interval. A displayed target does not establish a reliable buying opportunity. PASS means no usable 12-month projection is available, although a shorter chart may have support. Buyer and owner tests remain separate. Historical ranges describe recorded peer outcomes.
Responsible use
Use the forecast as one screening tool. Verify the actual product, examine recent sold listings, estimate your net proceeds, consider position size, and decide what loss you can tolerate. If a purchase only works when the center forecast is exactly right, the decision has no margin for model error.
Read the full forecast guide, then compare a strong modeled setup such as Ascended Heroes with a lower-confidence or pending set. The difference between those pages shows why the suggestion should always be read with its forecast range.