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US Median Age vs US Wind Power Generation

US Median Age and US Wind Power Generation correlate at r = +0.77 over 41 years (1983–2023), p < 0.0001. With the time trend removed, r = -0.83. Direction flips without the trend.

Verdict: Direction flips without the trend. The raw correlation is 0.77, but once each series' time trend is removed it becomes -0.83. The year-to-year movements run the opposite way to the long-run trends, so the headline number is misleading.

Pearson r
+0.77
p-value
< 0.0001
Years compared (n)
41 (1983–2023)
95% confidence interval
0.61 to 0.87
Correlation with the time trend removed
-0.83

Sources

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