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The phrase "a rough proxy for" is correct and usable in written English.
It can be used when discussing a substitute or approximation for something that may not be exact but serves a similar purpose.
Example: "In this study, we used average income as a rough proxy for overall economic well-being in the region."
Alternatives: "an approximate substitute for" or "a close approximation of".
Exact(41)
It's a rough proxy for pessimism and optimism.
Those imbalances are a rough proxy for capital flight.
Current accounts are a rough proxy for the economic health of eurozone states.
And we are clearly not fixing the problem of prisoner under-education if the statistics on prisoner literacy – a rough proxy for high school education – are any indication.
But measures of income inequality are misleading because an individual's income is, at best, a rough proxy for his or her real economic wellbeing.
Between 2008 and 2014 nominal GDP, a rough proxy for an economy's capacity to repay debts, fell by 22%, much more than any other European invalid.
Similar(19)
Here, synonymous (Ks) substitution rates are used as a rough proxy of duplication age.
The relative intensity of bands can provide a rough proxy of the proportional abundance of those taxa in the community.
Furthermore, we observed that body size has no effect, although we admit that it represents only a very rough proxy for population size estimates.
The forward scatter measurements are only a very rough proxy for cell size, and the measurements of WGA intensity (which should be indicative for bud scars) were not corrected for the background fluorescence.
As a rough proxy, look at President Bush's poll numbers.
More suggestions(18)
a rough substitute for
a crude proxy for
a coarse proxy for
a rough approximation for
a rough gig for
a rough season for
a rough stretch for
a rough start for
a rough go for
a rough transition for
a rough situation for
a rough tournament for
a rough month for
a rough decade for
a rough plan for
a rough time for
a rough word for
a rough week for
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com