The phrase "a subset of it" is correct and usable in written English.
You can use it when referring to a smaller group or portion that is part of a larger whole.
Example: "The research findings indicate that the data collected from the survey is a subset of it, representing only a fraction of the overall population."
Alternatives: "a portion of it" or "a segment of it".
In this most frequent case, the cascade of listeners simply accounts for the out-degree k out of the seed node (or a subset of it, if any of its neighbors is already counted in another cascade).
No DNS server contains the entire database; they only contain a subset of it.
As a subset of it, you can search for topics in school environmental health separately.
Finally, we construct a family of polyhedra, so-called generalised Chazelle polyhedra in which the set of reduced Chazelle polyhedra is a subset of it.
The other three algorithms: threshold, iterative and sampling are based on mining a process model from the log, or a subset of it.
Hybrid simulation is an experimental and computational technique which allows one to study the time evolution of a system by physically testing a subset of it while the remainder is represented by a numerical model that is attached to the physical portion via sensors and actuators.
Sustainable development is not a subset of development; it is development (in a modern world of resource limits).
This variance in penetration of social networks makes triangulation of data from multiple networks possible for only a subset of users; it's an incomplete data set.
Because this disorder may progress to classic achalasia, many believe that in at least a subset of patients it also represents the early stage of a myenteric plexus denervating disease.
Since the Paulson plan includes only a subset of borrowers, it will have a modest effect on overall foreclosures, and on resulting downward pressure on prices.
The survey had a subset of people it called "increasingly connected".
