RMD vs ZCMD: Correlation
How closely do ResMed (RMD) and Zhongchao Inc. - Class A (ZCMD) trade together? Their weekly returns over three years give a correlation of -0.18, which is negative.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are RMD and ZCMD?
Over the past 3 years, RMD and ZCMD moved with a correlation of -0.18, which is negative, meaning they tend to move in opposite directions. The past 12 months show a tighter link (-0.05) than the 3-year average (-0.18). Over 5 years the correlation is -0.10, and the annualized covariance of weekly returns is -803.4 %².
Among the 29 assets we track against RMD, ZCMD ranks #23 by 3-year correlation. Their recent paths diverged sharply: over the last 12 months RMD outperformed by 84.4 percentage points (-15.5% for RMD against -99.9% for ZCMD). Risk is not evenly split, since ZCMD carries 4.5 times the volatility of the other side.
How is this computed?
Pearson correlation on weekly returns: ρ(A,B) = cov(rA, rB) / (σA · σB), over windows of 52, 156 and 260 weeks. Covariance is annualized (×52) and expressed in %². Full definitions on the methodology page.
RMD vs ZCMD: side by side
| RMD (ResMed) | ZCMD (Zhongchao Inc. - Class A) | |
|---|---|---|
| 1-year return | -15.5% | -99.9% |
| 5-year return | -14.6% | -100.0% |
| Volatility (ann.) | 31.2% | 141.8% |
| Beta vs S&P 500 | 0.79 | 0.59 |
| Max drawdown (3Y) | -37.3% | -100.0% |
| Market cap | $34.0B | – |
| P/E (trailing) | 22.6 | – |
| Dividend yield | 1.02% | 0.00% |
| Sector / category | Health Care | US Listed |
Year-by-year returns
| Year | RMD | ZCMD |
|---|---|---|
| 2022 | -19.5% | -35.4% |
| 2023 | -16.5% | -69.5% |
| 2024 | +34.2% | -53.8% |
| 2025 | +6.3% | -72.2% |
| 2026 | -1.3% | -99.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are RMD and ZCMD good diversifiers for each other?
Yes. With a correlation of -0.18, RMD and ZCMD have moved largely independently, which makes them a genuinely diversifying pair by historical standards.
FAQ
What is the correlation between RMD and ZCMD?
Using weekly returns as of 2026-08-27: -0.18 over 3 years, with -0.05 over the last year and -0.10 over 5 years.
Is ZCMD a good diversifier for RMD?
Yes. With a correlation of -0.18, RMD and ZCMD have moved largely independently, which makes them a genuinely diversifying pair by historical standards.
What does a correlation of -0.18 mean?
A reading of -0.18 sits on a scale from −1 (opposite moves) through 0 (unrelated) to +1 (identical moves). Correlation captures direction, not magnitude or performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/rmd-vs-zcmd.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/rmd-vs-zcmd/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: RMD correlations · ZCMD correlations
