The phrase "a certain sector of" is correct and usable in written English.
It can be used when referring to a specific part or division of a larger group, organization, or industry.
Example: "A certain sector of the economy has shown significant growth in recent years."
Alternatives: "a specific segment of" or "a particular area of".
The idea is increasingly popular among a certain sector of the higher-education community.
One merely has to bring up Grahame's novel and a certain sector of British society swoons.
The Clarkes are well aware that they may be branded "scroungers" by a certain sector of society.
He has a friendlier vision, which in a certain sector of the restaurant world amounts to a radical one.
"I think that will appeal to a certain sector of society, people that want to adventure and live on the edge".
The missions of experts are thus directed either to the postal services in general or to a certain sector of postal activity.
An assumption is that these changes follow similar features or trends for KCs within a sector, since the same national macroeconomic and industry policies and similar market and technology conditions are shared by all KCs in a certain sector regardless of the region.
This happens when we are confident that a certain sector or class of securities will, in aggregate, perform very well, but are less certain about each individual member of the group.
Likewise, it can also be used to examine the IO data quality in a certain sector or even data of all regions as a whole (national IO data system).
In the case the number of already discovered nodes in a certain sector crosses the expected number of neighbors, the node may stop staying in that sector.
On the other hand, this is a common problem when FADN data are used, and despite this, a wide collection of literature has been produced on frontier analysis using this sort of data, explicitly or implicitly assuming that the evolution of the FADN sample is aligned with the evolution of a certain sector in each country (Madau 2011, 2015; Oude Lansink et al. 2002).
