The phrase "a set of countries" is correct and usable in written English.
It can be used when referring to a specific group or collection of countries that share certain characteristics or are being discussed in a particular context.
Example: "The conference will focus on a set of countries that are leading in renewable energy initiatives."
Alternatives: "a group of countries" or "a collection of countries."
Not bad for a set of countries roundly criticized for so-called inflexible labor policies and squashing their entrepreneurial instincts.
It is based on the growing affinity between a set of countries all betting on market economies, foreign investment and trade with Asia to achieve development.
In a set of countries ravaged by war - Central African Republic, the Democratic Republic of Congo, Niger, Chad, Somalia and others – there's seven girls per 10 boys in the classroom or less, but aid rarely arrives.
"At that point in Britain's history," she said, "it was important that there was a war that ensured that Europe could continue to be a set of countries which were strong and which could be working together".
A common approach in development economics is to use cross-country panel data, which is data collected for a set of countries over time and to control for unobserved factors that either vary across countries and are constant over time or vary over time and are constant across countries.
Prior research in 2005 and 2008 estimated planted forest investment returns for a set of countries and included some natural forest species in a few countries.
We provide here a set of country and regional-level indicators of socioeconomic and resource variables as estimated at the beginning of the 1990s.
Among the limited clutter is a stereo, a set of country and western tapes, and a book of nineteenth-century battles.
The second part provides evidence of the evolution of European policies in response to the globalization of corporate R&D, pointing out a set of country-specific examples and suggesting avenues for policy intervention at the EU level.
Last weekend, Gabe Bay and the Country Crickets, a band from Milltown, N.J., ripped through a set of country-western and 50's songs, inspiring members of the audience to dance a modified Texas two-step.
c i : A set of country-specific dummies.
