The phrase "an indicator of which" is correct and usable in written English.
It can be used when referring to a specific aspect or detail that signifies or points to something else.
Example: "The survey results serve as an indicator of which areas need improvement in our services."
Alternatives: "a sign of which" or "a marker of which".
Can students really use this as an indicator of which is the better place to study that course?
The constituency seats are not decisive in the formation of a government but serve as an indicator of which party is strongest in a given constituency.
The society, which comprises 55 professional movie-watchers in the employ of newspapers, magazines and Internet publications, has a reputation for picking artistic, thoughtful works, and its choices tend to serve as an indicator of which films will not win Academy Awards.
The Baftas can be an indicator of which films go on to win Academy Awards, which take place on 2 March.
Citation frequency is thus not taken to be a proxy for quality but as an indicator of which texts are widely used in this emerging field of research.
The Iowa Caucus (important because it kicks off voting and is viewed as an indicator of which Presidential candidates have a chance at winning the Republican nomination) results started pouring in around 7pm CST tonight.
He asked us if there was an indicator of "A3-21," wasch was the classmark for this book in the Musgrave library (one of the libraries that owned Newton's books).
Marital status is an indicator of stability, which thus provides implications for and background to a risky self-employed status.
Commodity prices are considered an indicator of inflation, which diminishes the value of fixed-income securities.
The pink stain (Safranin O) is an indicator of proteoglycan, which is abundant in healthy cartilage.
The total score of the CES-D items is generally used as an indicator of depression, which suggests a unidimensional structure.
