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The phrase "a direct indicator of" is correct and usable in written English.
It can be used when you want to describe something that clearly shows or signifies another thing.
Example: "The increase in temperature is a direct indicator of climate change."
Alternatives: "a clear sign of" or "a straightforward indication of".
Exact(60)
Surprisingly, MsDef1-γ4 variant with antifungal potency much higher than that of MsDef1 was also as ineffective as MsDef1 indicating that the ability to permeabilize plasma membrane is not a direct indicator of a peptide's antifungal potency.
Shipping is a direct indicator of whether people want goods, and softness in shipping prices is therefore a sign of weakness in manufacturing and construction.
Using plant uptake is a direct indicator of As bioavailability.
Groundwater temperature is a direct indicator of geothermal influence.
Thus, it is a direct indicator of the elongated nature of the basin.
The Mg2+/Ca2+ ionic ratio greater than 5 is a direct indicator of seawater contamination (Metcafe and Eddy 2000).
PGA is an expression of probable ground acceleration due to earthquakes; thus, it is a direct indicator of tectonic activity.
The betweenness centrality of a concept within a semantic network is a direct indicator of its influence [55, 65, 66].
Surface porosity would be a direct indicator of the elution efficacy from ALBC theoretically, but its measurement related to elution efficacy is still controversial.
This may be due to fact that the definition of SNR in this study is not a direct indicator of lesion detectability.
This cannot be interpreted as a direct indicator of MOOC quality, but it is not the main reason for criticism of underlying model.
More suggestions(15)
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a direct proportion of
a direct signal of
a direct measurement of
a straightforward indicator of
a true indicator of
a good indicator of
a direct descendant of
a crucial indicator of
a rough indicator of
a direct accusation of
a positive indicator of
a direct view of
a direct act of
a significant indicator of
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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