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US Female Labor Force Participation vs US Population

US Female Labor Force Participation and US Population correlate at r = -0.38 over 36 years (1990–2025), p = 0.021. With the time trend removed, r = +0.60. Direction flips without the trend.

Verdict: Direction flips without the trend. The raw correlation is -0.38, but once each series' time trend is removed it becomes 0.60. The year-to-year movements run the opposite way to the long-run trends, so the headline number is misleading.

Pearson r
-0.38
p-value
0.021
Years compared (n)
36 (1990–2025)
95% confidence interval
-0.63 to -0.06
Correlation with the time trend removed
+0.60

Sources

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