base rate:
Taiwan has never received a Level 4 advisory. The base rate for any Level 1 country jumping to Level 4 within 9 months is extremely low — perhaps 1-2% annually for stable democracies. There have been ~3 Taiwan Strait crises in 70 years, none of which triggered Level 4 advisories (the system didn't exist for all of them, but the 2022 Pelosi visit crisis did not trigger any change). The historical base rate code execution estimated ~2.9%.
evidence updates:
Justice Mission 2025 (Dec 2025) was unprecedented in scale and included live-fire exercises, flight disruptions for 100K+ travelers — this pushes UP significantly (+3-4%) as it demonstrates China's willingness to conduct very aggressive exercises. However, the State Dept's NON-response to Justice Mission 2025 is equally strong evidence pushing DOWN — it demonstrates an extremely high threshold for advisory changes regarding Taiwan. Chinese naval deployments in April 2026 push UP modestly (+1-2%). Iran war is ambiguous — could embolden China or distract from Taiwan. Trump administration's $11B arms sale shows continued support but also provocation dynamic. Net from base rate of ~3%: pushed up to ~6% accounting for the elevated military posture but anchored by the State Dept's demonstrated high threshold.
combination method:
Weighted average of sub-questions with adjustment for conditional logic. The critical bottleneck is that even significant military exercises (which are the most likely form of escalation) have proven insufficient to trigger advisory changes. Only actual conflict or clearly imminent invasion would likely trigger Level 4, and that scenario remains low probability.
final:
I estimate 6% probability. The geopolitical environment around Taiwan is more tense than the historical average, with Justice Mission 2025 representing a new baseline for Chinese military pressure. However, the State Department's non-response to those unprecedented exercises demonstrates that the threshold for Level 4 is very high — likely requiring actual armed conflict or credible imminent invasion intelligence. The probability of such an extreme scenario developing in the next 8-9 months, while non-trivial given current tensions, remains low.
ensemble:
{'ensemble_count': 3, 'perspectives': {'base_rate': {'p_yes': 0.06, 'confidence': 0.62}, 'evidence_driven': {'p_yes': 0.06, 'confidence': 0.62}, 'contrarian': {'p_yes': 0.09, 'confidence': 0.55}}, 'spread': 0.03, 'individual_p_yes': {'base_rate': 0.06, 'evidence_driven': 0.06, 'contrarian': 0.09}}