"rough prediction" is correct and usable in written English.
You can use it when you want to describe an estimate or guess about something that is based mainly on intuition or limited information. For example: "I think the stock market will go up next week, but at this stage it's just a rough prediction."
The Visa Bulletin provides a rough prediction of how long the wait will be in any given line.
However, this law is a rough prediction of the future of IC expansion.
Up to now, most of the design efforts have been based on a rough prediction of MLF without any actual support.
When a text message informed her that a powerful earthquake had struck the province of Sichuan, she leaned over to the man next to her, a veteran editor named Qian Gang, who had covered previous quakes, and asked him for a rough prediction of the damage.
The decision whether to switch off traction power or not is based on a rough prediction of the remaining travelling time that is compared to the scheduled time.
Once you've decided on the most meaningful metrics of influence, you can go on to use these metrics to make a rough prediction of just how influential any given person might be.
Unfortunately for forecasters, people aren't interested in rough predictions, such as "it's going to be close".
Although this uniformity allows very rough predictions of half-lives for undiscovered isotopes, the methods actually employed are considerably more sophisticated.
Using a representative state's policies, it provides rough predictions of how many nonresident fathers would have negative income after meeting their full child support obligations, their own basic needs and tax obligations.
Two weeks out "Green Lantern" was showing strong interest from men of all ages and solid interest among young women, leading to rough predictions of an opening weekend in the $50 million range, a robust result for a nonsequel.
Biochemists can thus resort to rough predictions of protein structure based on calculations of family resemblance.Proteins are composed of amino-acid building blocks, which come in 20 varieties.
