The phrase "a decent indicator of" is correct and usable in written English.
It can be used when discussing something that serves as a reasonable measure or sign of another thing.
Example: "The increase in sales is a decent indicator of the company's overall growth."
Alternatives: "a good sign of" or "a reliable measure of".
"This is a decent indicator of what is going on in the market," he said.
The wild swings are partly a product of a small sample, but they are a decent indicator of the Knicks' identity.
Still just 21, Maddison leads the Championship in both key passes per game (2.7) and the number of times he is fouled per game (3.8), which is a decent indicator of the threat he poses to opposition defences.
But as Omar Chaudhuri, the head of football intelligence at 21st Club points out, Sterling's numbers have not been inflated by unsustainable hot streaks, which therefore makes what we have seen so far a decent indicator of what will happen from now on.
A decent indicator of talent?
The Electoral College will decide the election at the state level, of course, but the national polls provide a decent indicator of the trends.
We'll start first with deal volume, because that's a fairly decent indicator of a geographic region's level of startup activity.
An ability to do lots of reasonably interesting things while also obtaining a decent degree result is a good indicator of someone who's relatively well-organised and can handle stress – key qualities for a corporate lawyer, which, to reemphasise, can be a really demanding job requiring sometimes extremely long hours.
The film was controversial during 2016's Cannes Film Festival – getting booed at a press screening and then receiving a five-minute ovation the next night at its premiere – which is a sharp indicator of a daring but decent film that routinely becomes a cult classic (Pulp Fiction, Antichrist, Taxi Driver, Marie Antoinette).
