PDEX vs UDR: Correlation
How closely do Pro-Dex, Inc. (PDEX) and UDR, Inc. (UDR) trade together? Their weekly returns over three years give a correlation of -0.17, which is negative.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are PDEX and UDR?
Across a 3-year window, the weekly returns of PDEX and UDR correlate at -0.17, negative, meaning they tend to move in opposite directions. Little has changed lately, as the 1-year reading of -0.20 lands near the 3-year figure. Stretching to 5 years gives -0.10, with an annualized covariance of -211.4 %².
Within PDEX's tracked universe of 31 assets, UDR comes in at #10 by 3-year correlation. The last year tells two different stories: PDEX led by 43.1 percentage points, +42.5% for PDEX against -0.6% for UDR. One caveat on sizing: PDEX is 2.8 times as volatile as the other leg, so an equal-dollar split is far from equal-risk.
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.
PDEX vs UDR: side by side
| PDEX (Pro-Dex, Inc.) | UDR (UDR, Inc.) | |
|---|---|---|
| 1-year return | +42.5% | -0.6% |
| 5-year return | +152.4% | -15.5% |
| Volatility (ann.) | 59.6% | 21.1% |
| Beta vs S&P 500 | 0.17 | 0.54 |
| Max drawdown (3Y) | -65.3% | -24.9% |
| Market cap | $0.2B | $13.6B |
| P/E (trailing) | 17.5 | 23.9 |
| Dividend yield | 0.00% | 4.56% |
| Sector / category | US Listed | Real Estate |
Year-by-year returns
| Year | PDEX | UDR |
|---|---|---|
| 2022 | -31.5% | -33.4% |
| 2023 | +10.2% | +3.1% |
| 2024 | +166.8% | +18.3% |
| 2025 | -17.7% | -11.8% |
| 2026 | +68.6% | +4.3% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are PDEX and UDR good diversifiers for each other?
Yes: at -0.17, the two have gone their own ways historically, which is what genuine diversification looks like.
FAQ
What is the correlation between PDEX and UDR?
As of 2026-08-27, the correlation of weekly returns between PDEX and UDR is -0.17 over 3 years, -0.20 over 1 year and -0.10 over 5 years.
Is UDR a good diversifier for PDEX?
Yes: at -0.17, the two have gone their own ways historically, which is what genuine diversification looks like.
What does a correlation of -0.17 mean?
On the −1 to +1 scale, -0.17 describes how much the two returns move together: +1 is lockstep, 0 is independence, negative values mean opposite directions. It says nothing about which performed better.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/pdex-vs-udr.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/pdex-vs-udr/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: PDEX correlations · UDR correlations
