The phrase "a useful rate" is correct and usable in written English.
It can be used when discussing a rate that provides value or benefit in a specific context, such as finance, statistics, or performance metrics.
Example: "The company offered a useful rate for their subscription service, making it more appealing to potential customers."
Alternatives: "a beneficial rate" or "an advantageous rate".
Mercury does not combine with oxygen to produce mercury II) oxide, HgO, at a useful rate until heated to the range of 300 to 350 °C (572 to 662 °F).
Thus he states that for evolutionary times over one million years, he uses a molecular clock of 2% per million years, but the reader understands why this is an approximation, what factors affect the accuracy of the estimate, and why it is nevertheless a useful rate for the purposes of the text.
We judged the latter to be a "useful" rate of service provision when judged against the reported 20% of Medicaid-enrolled children who reportedly receive preventive dental services in dental offices [ 13].
. So what are we trying to do? Essentially, we're adding a useful rating system to our reviews.
It's important to note that a down rating is not the same as a "Spam" mark, so it is actually a useful rating for people who you follow on purpose but don't really like.
To implement our evolution strategy, we first determined a useful mutation rate.
Material on African cancer cases admitted to Baragwanath Hospital, Johannesburg, over the years 1948-64 has been analysed, and it has been possible to obtain a useful incidence rate, a ratio study and a tribal analysis for purposes of comparison.
The reviews of the fixed product will be used to outweigh older ones of the broken product to create a more consistent and useful rating of the product users would receive now.
Finally we conclude with a useful rule for the sampling rates.
Although we did not allow for the detailed nature of the propagation pathway, these measurements gave us a useful estimate of the rate of conduction.
