Claim check: Uptober and the crypto Q4
“Bitcoin pumps in October and Q4 ('Uptober').”
What the data says
Not enough data Not enough data to say: the longest history gives only 13 observations of the period in question, fewer than the 15 needed.
Too few independent events or observations to judge either way.
Who says it
Crypto Twitter meme; BTC's Octobers were mostly green.
Origins are as commonly cited and were not independently verified.
How we tested it
Month-end to month-end returns for Bitcoin and Ether. October is compared with the other eleven months (Welch t-stat), in the full history and in both halves; the whole fourth quarter is shown as a second look. Bitcoin has about a dozen Octobers and Ether fewer, so the significance guard is hard to pass.
Results
| Market | Observations | Mean | Rest | Difference | Up share | t-stat | Rank of 12 | Reading |
|---|---|---|---|---|---|---|---|---|
| Bitcoin | 13 | +14.8% | +4.7% | +10.05% | 69% | 1.8 (likely noise) | 1 | Too little data |
| Ether | 9 | +4.2% | +5.0% | -0.77% | 56% | -0.1 (likely noise) | 7 | Too little data |
Average monthly return by calendar month (Bitcoin)
0 of 2 markets had enough data.
Stability across the two halves of history
A saying that only works in one half of the history is not much of a rule. Each row shows the effect in the full history, the first half and the second half; green means the claimed effect was present.
| Market | Full history | First half | Second half |
|---|---|---|---|
| Bitcoin | +10.1% | +8.9% (6) | +10.9% (7) |
| Ether | -0.8% | +0.1% (4) | -1.3% (5) |
Context and cross-checks
Shown for context; not part of the verdict.
The whole fourth quarter (October to December)
| Market | Observations | Mean | Rest | Difference | Up share | t-stat | Rank of 12 | Reading |
|---|---|---|---|---|---|---|---|---|
| Bitcoin | 37 | +9.9% | +4.2% | +5.78% | 57% | 1.4 (likely noise) | — | Right way, likely noise |
| Ether | 26 | +5.0% | +4.9% | +0.11% | 50% | 0.0 (likely noise) | — | Right way, likely noise |
Average monthly return by calendar month (Bitcoin)
The honest caveat
About a dozen observations, with a strong dependence on bull-cycle timing.
Descriptive statistics from historical data, before costs. Not a forecast and not investment advice.
Questions
Bitcoin pumps in October and Q4 ('Uptober').
Not enough data to say: the longest history gives only 13 observations of the period in question, fewer than the 15 needed.
How was this claim tested?
Month-end to month-end returns for Bitcoin and Ether. October is compared with the other eleven months (Welch t-stat), in the full history and in both halves; the whole fourth quarter is shown as a second look. Bitcoin has about a dozen Octobers and Ether fewer, so the significance guard is hard to pass.