CorrelateAI › Pairs

US Marriage Rate vs US College Enrollment

US Marriage Rate and US College Enrollment correlate at r = -0.90 over 38 years (1971–2022), p < 0.0001. With the time trend removed, r = +0.15. Likely spurious (shared time trend).

Verdict: Likely spurious (shared time trend). Both series mostly just trend over time. After removing that trend the correlation collapses to 0.15 — the relationship is probably coincidental, not causal.

Pearson r
-0.90
p-value
< 0.0001
Years compared (n)
38 (1971–2022)
95% confidence interval
-0.95 to -0.82
Correlation with the time trend removed
+0.15

Sources

Related pairs

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