The phrase "an indicator of whether" is correct and usable in written English.
It can be used when discussing a sign or measure that helps determine a particular condition or outcome.
Example: "The survey results serve as an indicator of whether the new policy is effective in improving employee satisfaction."
Alternatives: "a sign of if" or "a measure of whether".
The following three indices can be considered as an indicator of whether items can be mapped clearly to one factor (high values) or not (small values) [ 28].
Northwest Airlines, traditionally an indicator of whether a price increase will hold, said today that it was matching Continental.
Selective colleges use students' enrollment in those programs as an indicator of whether applicants have taken the most challenging courses available to them.
The vote was seen as an indicator of whether Switzerland was turning away from its more welcoming past as immigrants flood the country.
In my interviewing, I began to develop what I thought was an indicator of whether someone was going to be a good surgeon or not.
The technology world is scrutinizing Snap as an indicator of whether smaller social media companies can compete with behemoths like Facebook.
This report measures the number of job openings across the country, an indicator of whether employers feel confident enough to spend on new salaries.
They also see the primary as an indicator of whether an ambitious education agenda pushed by charter school advocates will gain momentum.
The contest looked unpredictable, a rarity in today's Russia, and attracted international attention, in part as an indicator of whether Mr. Medvedev would prove more tolerant of dissent than was his predecessor, Vladimir V. Putin.
Human-rights groups and civil-liberties lawyers are watching the situation closely, as an indicator of whether the Obama Adminstration will support the Bush Administration's aggressive claims to executive detention powers in the war on terror.
This year Coixet is one of three female directors in competition at the Berlinale, but it is questionable whether the gender of a director is necessarily an indicator of whether a film will depict a female sensibility.
