The phrase "a group for which" is correct and usable in written English.
It can be used to specify a particular group that is relevant to the context being discussed.
Example: "We are conducting a survey for a group for which we need more data to understand their preferences."
Alternatives: "a group that" or "a group to which".
For a community perpetually disenchanted by the political "Establishment"—a group for which Hillary Clinton is seen as the poster girl Sanders's surprisingly successful presidential run has become a sort of lightning rod for its hopes and aspirations.
Overt and ugly racism is for bogans (ironically a group for which Spurr holds a special disdain).
He'd been among a group for which I once played "This Is Your Story," which, for all his knowledge of comedy, he had never seen before.
We investigated the functionally important yet relatively neglected ectomycorrhizal fungi (EMF), a group for which the importance of forest age has not been assessed in broadleaved forests.
One member, Monica Blum, testified at a recent City Council hearing in favor of a project that would benefit the Lincoln Square Business Improvement District, a group for which she serves as president.
Douglas Harris of the Economic Policy Institute (a group for which I also do research) examined such schools, focusing on those for which data from more than one year, grade and subject were available.
Community refers to a geographic group for which a health organization is responsible.
A range of her clients includes the American Association of Railroads and a distillers' group for which she heads a campaign against under-age drinking and drunken driving.
A biography on the website of the Leadership Institute, a conservative group for which this Maloney was once a guest speaker, indicates that he has a Ph.D. in politics from the University of Oxford but not a medical degree.
We are thus not comparing a young to an old group for which ANCOVA would not be appropriate as it would involve extrapolation.
A statement from the Versailles prosecutor said the alleged crime of conspiracy to blackmail and participating in a criminal group for which he was being investigated could carry a prison sentence of at least five years.
