Correlation Analysis
American Electric Power Company, Inc. vs Costco Wholesale Corp
AEP vs COST
+0.647
Moderate positive
When one moves up, the other tends to follow.
American Electric Power Company, Inc.
↗AEP
American Electric Power is one of the largest regulated utilities in the United States, providing electricity generation, transmission, and distribution to more than 5 million customers in 11 states. About 39% of AEP's capacity is coal, with the remainder from a mix of natural gas (28%), renewable energy and hydro (23%), nuclear (7%), and demand response (3%). Vertically integrated utilities, transmission and distribution, and generation and marketing support earnings.
Market cap 71.9B · 17,581 employees
Costco Wholesale Corp
↗COST
Founded in 1983, Costco Wholesale now operates a global chain of membership-based warehouse clubs, delivering high-quality goods and services at consistently low prices. As of its most recent fiscal year, Costco operated approximately 910 warehouses, serving more than 80 million members across its three geographic segments: Costco US (approximately 73% of total revenue), Costco Canada (13%), and Costco International (14%).Costco's core value proposition—quality products at unbeatable prices—has yielded consistently strong member renewal rates (93% in the US and Canada and nearly 90% internationally). About 55% of Costco's fiscal 2025 revenue came from its grocery offerings, and another 25% from general merchandise.
Market cap 451.9B
Time Series
Relative Performance
Who Moves First
COST leads AEP by 6 days
COST tends to move before AEP.
After testing 13 timing shifts, the strongest relationship was +0.653 (they moved in the same direction).
Do They Crash Together?
Correlation by Market Regime
How these series behave when markets are rising, falling, or diverging. A correlation that holds in drawdowns is very different from one that only works in rallies.
Both Rising
+0.203
12 periods · Return correlation when both series rose
Both Falling
-0.185
6 periods · Return correlation when both series fell
Diverging
-0.547
17 periods · Return correlation when series moved apart
R-Squared
41.8%
Share of variance in one series explained by the other.
Trend Agreement
59.4%
How often both series moved in the same direction period-to-period.
Overlap Quality
1,254
Deep shared window — 1,254 usable pairs.
Significance
p < 0.001
95% CI: [0.613, 0.678]
Scatter
XY Regression
Pipeline
Data quality details
Pipeline
Data quality details
Pipeline Summary
1,254 paired data points survived the daily window.
Raw input
1,254
1,254
Normalized
1,254
1,254
Prepared
1,254
1,254
Aligned
1,254
1,254
Invalid removed
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
0
A: 0 / B: 0
Series A
American Electric Power Company, Inc.
AEP
Market cap 71.9B · 17,581 employees
Stock · 1,254 raw → 1,254 prepared
Series B
Costco Wholesale Corp
COST
Market cap 451.9B
Stock · 1,254 raw → 1,254 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
5
Estimated crossover points between normalized spreads.
Slope
10.8698
Linear regression slope.
Intercept
-350.8150
Linear regression intercept.
Related Extremes
Highest and Lowest Correlated
AEP
American Electric Power Company, Inc.
Highest
+0.797
Walmart Inc. Common Stock
WMT · 1,254 data points
Lowest
+0.510
Exxon Mobil Corporation
XOM · 1,254 data points
Saved 7 hours ago · ID: stock-aep-vs-stock-cost-daily