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Tokyo Average Temperature vs US Nuclear Power Generation

Tokyo Average Temperature and US Nuclear Power Generation correlate at r = +0.62 over 61 years (1965–2025), p < 0.0001. With the time trend removed, r = -0.36. Direction flips without the trend.

Verdict: Direction flips without the trend. The raw correlation is 0.62, but once each series' time trend is removed it becomes -0.36. The year-to-year movements run the opposite way to the long-run trends, so the headline number is misleading.

Pearson r
+0.62
p-value
< 0.0001
Years compared (n)
61 (1965–2025)
95% confidence interval
0.44 to 0.75
Correlation with the time trend removed
-0.36

Sources

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Correlation does not imply causation. How the verdict is worked out.