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Correlate

Correlation Analysis

Costco Wholesale Corp vs ResMed Inc.

COST vs RMD

+0.268

Light positive

When one moves up, the other tends to follow.

COST logo

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

RMD logo

ResMed Inc.

RMD

ResMed is one of the largest respiratory care device companies globally, primarily developing and supplying flow generators, masks and accessories for the treatment of sleep apnea. Increasing diagnosis of sleep apnea combined with ageing populations and increasing prevalence of obesity is resulting in a structurally growing market. The company earns roughly two thirds of its revenue in the Americas and the balance across other regions dominated by Europe, Japan and Australia. Recent developments and acquisitions have focused on digital health as ResMed is aiming to differentiate itself through the provision of clinical data for use by the patient, medical care advisor and payer in the out-of-hospital setting.

Market cap 32.8B · 10,600 employees

Apr 9, 2021 — Apr 7, 2026Daily1,254 data pointsStockStockConsumer

Time Series

Relative Performance

Green: COSTGray: RMD36 of 1,254 points (sampled)

Who Moves First

in sync

COST and RMD tend to move at the same time.

After testing 13 timing shifts, the strongest relationship was +0.268 (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

+0.016

16 periods · Return correlation when both series rose

Both Falling

+0.763

9 periods · Return correlation when both series fell

Diverging

-0.261

10 periods · Return correlation when series moved apart

R-Squared

7.2%

Share of variance in one series explained by the other.

Trend Agreement

63.0%

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: [0.216, 0.319]

Scatter

XY Regression

3064006008001,0001,134124.8150200250300308.2Costco Wholesale CorpResMed Inc.Data pointsFit (r = 0.268)

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

COST logo

Costco Wholesale Corp

COST

Market cap 451.9B

Stock · 1,254 raw → 1,254 prepared

Series B

RMD logo

ResMed Inc.

RMD

Market cap 32.8B · 10,600 employees

Stock · 1,254 raw → 1,254 prepared

Sign agreement

100.0%

How often both values share the same sign.

Zero crossings

1

Estimated crossover points between normalized spreads.

Slope

0.0414

Linear regression slope.

Intercept

198.0414

Linear regression intercept.

Related Extremes

Highest and Lowest Correlated

Saved 6 hours ago · ID: stock-cost-vs-stock-rmd-daily