The phrase "a quarterly average" is correct and usable in written English.
It can be used when referring to an average calculated over a three-month period, often in financial or statistical contexts.
Example: "The company's quarterly average revenue has shown a steady increase over the past year."
Alternatives: "average per quarter" or "quarterly mean".
It suggested momentum was continuing after a poor year in 2011 which had a quarterly average of 12 - the lowest average since 2003.
The figure has been below the government's 95% target since the end of September - though it is important to point out that the target relates to a quarterly average rather than week by week fluctuations.
Expansion stage investment came in at $185 million, falling from a quarterly average of $352 million last year.
Early stage investment into Los Angeles area companies fell to $78 million in the first quarter, down from a quarterly average of $247 million in 2015.
Manchester has the largest UK office market outside London according to GVA Grimley with a quarterly average office uptake of approximately 230,000 square ft – more than the quarterly office uptake of Leeds, Liverpool and Newcastle combined and nearly 80,000 square feet more than the nearest rival Birmingham.
O3 and PM10 are correlated on a quarterly averaging time, because wind-blown dust and resuspended road-dust emissions cause relatively high PM10 levels during the dry season when O3 levels also are high.
The estimated effect of a 10-ppb increase in the quarterly average 1-hr maximum O3 was 1.4 discharges per 105 age-eligible population (95% CI, 0.71 2.09 per 105 population).
Unlike other indices, Halifax bases this figure on a comparison of quarterly averages, and a straightforward comparison of average prices in March 2013 and March 2014 showed a rise of 8.4%.
So let's take the quarterly average for the company as a starting point.
"That's a staggering increase, since we have never seen the quarterly average for condos exceed $700,000," Mr. Miller said.
In order to ensure the optimum level of quality care for pregnant women and their infants, the Bureau of NHI BNHII) has placed the CS rates of all providers under close scrutiny, adopting actual quarterly average rates by region and/or hospital accreditation levels, as a means of evaluating hospital/physician obstetric practice patterns [ 4].
