The phrase "a first indication of" is correct and usable in written English.
It can be used to suggest an initial sign or clue about something, often in a context of analysis or observation.
Example: "The data provided a first indication of a potential trend in consumer behavior."
Alternatives: "an initial sign of" or "a preliminary indication of".
Comparing results from testing with the ({text{LoC}}_{text{indicator}}^{text{n}}) for each of the measurement endpoints will give a first indication of the risks to a specific indicator used for testing.
Do you see this angry reaction as something that would not be repeated by more mindful adults, or as a first indication of an enduring undercurrent?
Indeed, the event is providing a first indication of the type of structural and infrastructural costs meteors can exact from a highly industrialized society.
"If foreign banks are cutting credit lines for corporates, that could be a first indication of a credit crunch," Mr. Potter said.
While this is a "blunt instrument" for measuring universities' potential to do well in the next year's RAE, it does give a first indication of how they will fare.
Other Warrington players talk of Smith's first video session, when he spent more than half an hour dissecting their slapdash kick-off routine, as a first indication of the impact he would make.
His choice of powerful rivals for his Cabinet was, Goodwin writes, "evidence of a profound self-confidence and a first indication of what would prove to others a most unexpected greatness".
A first indication of formation fluid in live fluid analyzer (LFA) was detected in <30 min.
This is a first indication of the production technology of eighteenth century glass glitter.
Such results provide a first indication of discriminant validity of the constructs.
We have here a first indication of the positive selection of Egyptian emigrants, which is also highlighted in Wahba (2015).
