The phrase "a weakened correlation" is correct and usable in written English.
It can be used when discussing the strength of a relationship between two variables, particularly in statistical or research contexts.
Example: "The study revealed a weakened correlation between exercise frequency and weight loss over the past year."
Alternatives: "a diminished relationship" or "a reduced association."
Both Harris et al (1990) and Fleming et al (1992a) initially reported a correlation between PBM DPD activity and 5-FU clearance but re-examination of this relationship in a larger set of patients revealed a markedly weakened correlation (Etienne et al, 1994).
This observation may be explained by Canada's relatively strong social programs, which may have weakened correlations between older homes and living in poverty as seen in the United States.
Clearly, such underlying complexities in SP functionality, will weaken correlations between SP sequence properties and secretion levels.
The net effect of these sources of variation is to weaken correlations between the dietary intake assessment and the biomarker.
The use of full buffer areas in these situations will dilute attempts to delineate epidemiological risk areas and will weaken correlations between the locations of cases and the occurrence of specific landscape features (e.g. specific types of land cover).
Have a weakened immune system.
More generally, if the precedent set by Bloom and Adami were to be followed, then any variable A that only partially weakens a correlation between two other variables B and C when it is statistically controlled for could be claimed to be completely responsible for the correlation between B and C, if the values of A are not known with perfect precision.
The greater variation of floral traits in later flowers compared to early flowers of A. gymnandrum may be in part due to weakened trait correlations of family means (i.e. weakened genetic correlation).
A weakening manufacturing sector.
The first is a weakening commercial spirit.
