The phrase "a straightforward correlation between" is correct and usable in written English.
It can be used when discussing a clear and direct relationship or connection between two variables or concepts.
Example: "The study found a straightforward correlation between exercise frequency and overall health."
Alternatives: "a clear relationship between" or "an obvious link between".
An SFF-type set-up displayed a straightforward correlation between the expected amount of released glucose and the ethanol yields.
Common sense would suggest a straightforward correlation between higher speed limits and the risk of accidents, but common sense also suggests -- out West, at least -- that when there's nothing to have an accident with, it's not momentum that matters but simple alertness.
"..it's just a straightforward correlation between walking more and being generally fitter in old age, sort of makes sense".
Since a certain percentage of the US findings found is not responsible for the reported complaints [ 21, 22], GPs should realise that there might not be a straightforward correlation between US and clinical findings.
Beckstrom and colleagues in their elegant study of AD patients with ages from 69 to 94 (Beckstrom et al., 1999) claim individual differences in the levels of glutamate transporters, thus rejecting a straightforward correlation between reduced glutamate transporter expression and AD (Li et al., 1997).
Although the improvement of speech perception with cochlear implant use may be related to the stimulation of preserved proximal portions of auditory fibres, there does not seem to be a straightforward correlation between improvement of speech perception scores with cochlear implant use and wave V detection in electrically-evoked ABRs.
However, there was no straightforward correlation between the stress pattern and microtubule alignment; supracellular patterns appeared curved and not following the direction of overall load application.
The absence of straightforward correlations between enzyme sequences and product structural features (the size of the macrocycle, the conformation of the exocyclic methyl group, or the extent of reduction by the hrPKS) suggest that BDL structural variety is the result of a select few mutations in key active site cavity positions.
