The phrase "as a direct comparison" is correct and usable in written English.
It can be used when you want to clarify that you are making a straightforward or explicit comparison between two things.
Example: "The author uses the phrase 'like a lion' as a direct comparison to emphasize the character's bravery."
Alternatives: "in a straightforward comparison" or "as a clear analogy".
This paper does exactly that insofar as a direct comparison of similar mass per unit area polyester (PET) versus polypropylene (PP) geotextiles are concerned.
Thus, our assessment of performance characteristics using the BRCA1 data set is not meant as a direct comparison but as reference to highlight how different tools can be used in a complementary manner to accelerate variant annotation.
Although the trial was not designed as a direct comparison between 'wet' and 'dry' digestion, the specific biogas yield of the 'dry' digesters was 90% of that produced by 'wet' digesters fed on the same waste at the same OLR.
It is hard to see the cat mouth as a direct comparison, but on the other hand it has a very intimate association with the use of kennings, being used in all faces which establish kennings except for the small snake heads.
As a direct comparison between the two datasets for a common specific period and sites is not possible, a statistical approach was adopted to test the hypothesis that the TRMM 3B42 estimates and the ground monitoring records exhibit similar statistical characteristics.
As a direct comparison of user-based LWMF, we also implement item-based LWMF, which only considers items to select the anchor points and lets all users into the sub-matrix.
This enabled us to collect comprehensive feedback, as well as enabling a direct comparison of the perceptions of both parties at the level of each individual placement.
Presumably he was trying to make the numbers seem relevant, but perhaps he would have been better off framing the projected cost as "£2.5bn a week" so as to provide a direct comparison with the Leave campaign's £350m.
We reanalyzed the empirical data used by Pons et al. to illustrate the original formulation of the GMYC so as to provide a direct comparison of the implementations using representative data.
Replication with a larger sample will be necessary, as well as extension to a direct comparison between probands and their own first-degree relatives (parents and siblings).
Studies would still be considered if they compared these individuals with lower-risk individuals, as long as there was a direct comparison between two groups of high-risk individuals receiving or not receiving a household intervention.
