The phrase "a formal study has" is correct and usable in written English.
It can be used when discussing research or analysis that has been conducted in a structured and systematic manner.
Example: "A formal study has revealed significant correlations between diet and health outcomes."
Alternatives: "an official study has" or "a structured analysis has".
(No formal study has been done on pedophilia in the general population, but experts generally agree that the figure for abuse of prepubescents is below four per cent).
Nonetheless, the balance between the system's risks and benefits is unclear, the report concludes, because no "comprehensive formal study" has ever weighed them.
At least one formal study has determined that healthy people using nootropics experience no significant gain.
As PPS is becoming more widely used in palliative care, and no formal study has been done on its inter- and intrarater reliability and validity, it is important for clinicians to have solid evidence that PPS % level scores can be repeated consistently and also accurately reflect the functional status of the patients assessed.
Hubbard is said to have "decid[ed] that formal study had nothing more to offer".
However, no formal studies have demonstrated the efficacy of a second TNF inhibitor in inhibiting radiographic progression in patients who responded inadequately to prior TNF inhibitor treatment.
"In Syria there was simply no data on violence against women; formal studies hadn't ever been done before," said Shirin Shukri, a manager of the project at the United Nations regional office in Amman, Jordan.
Experimental use for non-physiological cavities, vascular lines and bowel implementations have been performed at our institution and, although feasible, formal studies have not yet been conducted despite anecdotal benefit, as befits a new technique.
While a number of studies of have established that allopathic physicians feel that patients with fibromyalgia are difficult to treat and that there is a general skepticism around the diagnosis itself [ 3, 4, 17- 20], no formal studies have explored the attitudes of CAM providers and allied health professionals towards this challenging condition.
