The phrase "a vast study" is correct and usable in written English.
It can be used to describe a research project or investigation that covers a large scope or extensive amount of data.
Example: "The researchers conducted a vast study on the effects of climate change on marine biodiversity."
Alternatives: "an extensive study" or "a comprehensive study".
This is demonstrated in a vast study.
However, in 2006 three Chinese academics began a vast study of the performance of privatised companies, summarised in a recent working paper*.
When clinical trials conducted with zofenopril began with a vast study program called SMILE, certain questions remained unanswered, notably the long-term benefit of the ACE inhibitors beyond a short administration period.
Bribing, it turns out, doesn't always speed things up: in a vast study of twenty-four hundred companins in fifty-eight countries, Daniel Kaufmann, of the World Bank, and Shang-Jin Wei, of the I.M.F., found that the more a company had to bribe, the more time it spent tied up in negotiations with bureaucrats.
There was so much concern that a vast study of almost half a million people was conducted by the US National Cancer Institute and published in 2006.
In 2013 a vast study covering more than 300,000 people in eight European countries found no link between the development of Type 2 diabetes and eating or drinking artificial sweeteners.
METHODS: Data were from the VA Acute Stroke (VASt) study, a nationwide prospective cohort of 1073 acute stroke patients admitted at any of 9 Department of Veterans Affairs Medical Center sites between April 1 , 1995 and March 31 , 1997
The study is performed with a nonlinear, finite-element based model from which a vast parametric study is developed.
Finally an excerpt from diagnostic system performance evaluation obtained from a vast experimental study is provided.
The following year, a newly Republican Congress put him in charge of a vast efficiency study of the federal government.
