The phrase "a weak link between" is correct and usable in written English.
It can be used to describe a connection or relationship that is not strong or reliable, often in discussions about systems, arguments, or relationships.
Example: "There is a weak link between the two theories, which raises questions about their overall validity."
Alternatives: "a tenuous connection between" or "a fragile relationship between".
But critics say there is only a weak link between racial and academic diversity.
That is why their analysis in general shows only a weak link between ESI score and land area.
Only in the first group, the professors say, does rule-of-law reform get far.Consistent with that rather gloomy finding, some new research finds only a weak link between the rule of law and economic growth.
When told that some historians see only a weak link between the world of "The White Ribbon" and the development of Nazism, Mr. Haneke said there is "a vast spectrum of opinion on this question," which he would prefer not to address: "When I offer explanations or commentary, I limit the possible views of the spectators".
They were also told that the incidence of new schizophrenia cases reported to GPs had gone down, not up, between 1998 and 2005, indicating a weak link between increased potency and use in the past two decades and mental health problems.
We also observed that there was a weak link between being underweight and migraine severity and disability.
For those participants who reported higher initial dysphoria, there was a stronger association between negative mood and thinking and a weaker link between positive mood and thinking.
That is the conclusion of a report, revealed by Newsnight, showing a weaker link between immigration and unemployment among British people than the government has previously claimed.
Participants who felt lonely and isolated reported a weaker link between CHD and depression because their loneliness itself made them depressed.
Although Tastan et al. [ 19] estimated a relatively weak link between binding motif/domain presence and the actual virus-host PPIs, their work was restricted to predicting direct binding between host and HIV-1 proteins.
It is not clear whether the lack of strong associations is due to confounding factors (e.g., dietary exposure), to variability in the biologic measurements (including toxicokinetic considerations (discussed below), or to a relatively weak link between residential contamination and child exposures.
