The phrase "a broad indication" is correct and usable in written English.
It can be used when you want to convey a general or vague sense of something without going into specific details.
Example: "The survey provided a broad indication of customer satisfaction, but more detailed feedback is needed for improvement."
Alternatives: "a general sense" or "a rough idea."
These indicate that four raters would be sufficient to provide a broad indication of domains where a doctor may have some performance issues.
Because there are three different criteria for such status income per head, a human assets index comprising health, nutrition, literacy and school enrolments, and an economic vulnerability index (which uses various measures to assess a country's exposure to natural and climatic setbacks)—the data, based on figures for income per head, give no more than a broad indication of graduation timetables.
Extensive grazing led to slow but continual changes in composition, with some increase in diversity compared to intensive grazing and a broad indication that productivity did not decline with time.
The utility of a national drought monitor (US Drought Monitor; http://droughtmonitor.unl.edu/CurrentMap/StateDroughtMonitor.aspx CA) provides a broad indication of conditions but does not address the different kinds of drought explicitly nor how they differ across the landscape.
A broad indication of a graduate skill level in some jobs is whether the job requires jobholders to have had a long-lasting formal training for the type of work they do.
A newly available European riparian zone distribution dataset and continental land-cover change information allowed us to obtain an unprecedented continental overview of riparian land conversion and associated drivers, as well as a broad indication of their loss of capacity to provide ecosystem services.
The S&P 500, a broader indication of the market's performance, fell 0.76%.
The Nasdaq Composite Index fell 0.77% to 3421 while the S&P 500, a broader indication of the market's direction was off 0.62% at 1408.
The tech rich Nasdaq Composite Index fell 1.37%, while the S&P 500, a broader indication of the market's direction, dropped 0.86%.
The tech-heavy Nasdaq Composite Index rose 0.67% while the S&P 500, a broader indication of the market's performance, climbed 0.02%.
The tech rich Nasdaq Composite Index limbed 0.29% while the S&P 500, a broader indication of the market's performance rose 0.24%.
