The sentence "the rate has changed" is correct and usable in written English.
You can use it in any context where a rate has changed. For example: Due to the recent economic downturn, the interest rate has changed from 4.5% to 2.5%.
After dropping rapidly in a long economic boom and a government war on poverty in the 1960's, from more than 22percentt in 1960, the rate has changed relatively little over the last four decades.
You might argue that if banks as a group aren't actually paying any more tax, and only the rate has changed, they shouldn't complain.
Those pressure readings were compared with pressure estimates when the well was first drilled to determine whether the rate had changed over time, which it apparently had.
Those pressure readings were compared with pressure estimates when the well was first drilled to determine if the rate had changed over time, which it apparently did.
Neither the views nor the rates have changed appreciably (they start about $430 a night).
Both figures confirm that the responsiveness of wage dynamics to the unemployment rate has changed since the pre-crisis period.
Although estimates of the flow rate have changed drastically — to 35,000 to 60,000 barrels a day now, from 1,000 barrels a day originally — it is also not known if the actual rate has changed in the two months since the gusher began.
This hypothesis fails to explain why the transcription rate has changed during the STEADY-STATE period, but may explain the decrease in P1 transcription during the DECREASE period.
What it shows is that even though the vacancy rate, or job openings, increased over the last few months, the unemployment rate has changed very little.
Few understand that the tax rate has changed with the new year's municipal and school budgets.
There is no indication [ 6] that the surgical rate has changed under influence of the consensus reports [ 11, 12, 11].
