The phrase "a decrease in segregation" is correct and usable in written English.
It can be used when discussing changes in social, racial, or economic separation between groups in society.
Example: "The city has implemented several policies aimed at achieving a decrease in segregation within neighborhoods."
Alternatives: "a reduction in segregation" or "a decline in segregation".
Dollis Hill in Brent and Plaistow North in Newham, for example are the most diverse electoral wards in England and Wales but are both in districts which have seen a decrease in segregation.
Dr Catney's briefing for the Centre on the Dynamics of Ethnicity at Manchester university, reveals that the most ethnically diverse neighborhoods are in districts which have seen a decrease in segregation for the majority of ethnic minority groups.
Leicester, Birmingham, Manchester and Bradford, along with other large cities, have recorded a decrease in segregation for most ethnic groups and interestingly the data shows that rural areas and small cities and towns are becoming more ethnically mixed.
The shift in immigration, along with a decrease in segregation between ethic groups, has contributed significantly to the ethnically diverse composition of the city today.
Such segregation indices can also be used in a positive fashion, such as discerning which of two industries has smaller segregation (greater diversity) or whether a given industry has had a decrease in segregation (increase in diversity) over time.
Cutler and Glaeser (1997) reported that a decrease in segregation by one standard deviation (13%) would eliminate one-third of the black white differences in education and employment.
In fact, recent research has shown that as little as a 1-standard-deviation decrease in segregation would eliminate one-third of the black-white differences in life experiences, such as dropping out of high school, lacking a job, or becoming a single parent (Cutler and Glaeser,1997).
Silicon segregation at, and partitioning to, θ′ precipitates results in a decrease in interfacial free energy, and concomitantly an increase in the nucleation current.
"Ivan took a decrease in compensation last year.
"There is a decrease in fidelity".
