The phrase "effective proxy" is correct and usable in written English.
It can be used in contexts where you are discussing a substitute or representative that performs well in a specific role or function.
Example: "In this study, we used an effective proxy to measure the impact of social media on consumer behavior."
Alternatives: "efficient substitute" or "reliable representative."
The present results are difficult to reconcile with the notion that 2D∶4D is an effective proxy for prenatal androgen exposure; instead, it may more accurately reflect effects of glucocorticoids, or other factors that regulate any of many genes.
Effective proxy statements are improving readability through enhanced formatting and graphics, demonstrating board engagement and effectiveness, and addressing key interests of institutional investors.
Aung San Suu Kyi is barred from the presidency by the junta-era constitution and has anointed her schoolfriend and close aide Htin Kyaw as president to act as her effective proxy.
The favoured option, according to two administration officials, is to press forward with a training mission, led by elite special operations forces, aimed at making non-jihadist Syrians an effective proxy force.
However, methods that identify local riparian vegetation condition, an effective proxy for riparian health, have not been applied across broad, regional extents.
It is particularly galling for the Saudis to see that their regional rival, Iran, has no such fears as it carries out a far more effective proxy war in Syria.
Cabinet secretaries given a more prominent role would also enjoy a higher profile, enhancing their effectiveness in Washington and beyond, and enabling them to serve as more effective proxies for the president.
Almost none of the U.S. News variables, in fact, seem to be particularly effective proxies for engagement.
Your most effective proxies aren't always the most obvious ones.
In the same spirit, truly hopeless public speakers of whom there are very few, by the way—should concentrate on grooming effective proxies.
Odonata distribution differed to that of other groups, indicating that single taxon groups may not be effective proxies for other priority biodiversity.
