The phrase "ascertained by comparison" is correct and usable in written English.
It can be used when discussing the process of determining the value, quality, or characteristics of something by comparing it to another item or standard.
Example: "The accuracy of the measurements was ascertained by comparison with the standard reference."
Alternatives: "determined through comparison" or "verified by comparison".
The reliability and usefulness of the model are ascertained by comparison of the simulation results with matrix-type vaginal ring experimental release data reported in the literature.
The reliability of the mathematical and numerical procedures is ascertained by comparison of the simulation results with experimental and numerical data existing in the literature, and also matching, as asymptotic case, the solution of the diffusion equation with a continuum dissolution source described by the Noyes–Whitney equation.
In addition, the full potential of adult stem cells can probably only be ascertained by comparison with pluripotent stem cells from the opposite end of the developmental biology spectrum.
Protein-coding genes were identified using GETORF from EMBOSS 6.0.1 [60] and ORFFINDER at NCBI, with start codons ascertained by comparison with known homologues.
Furthermore, the identity was ascertained by comparison to an authentic standard synthesized enzymatically.
The identity of each fatty acid peak will be ascertained by comparison of peak retention time with a previously characterized mixture of 20 fatty acids.
The correctness of the results has been ascertained by a comparison, using experimental approach as well as different analytical technique; and very good agreement has been obtained.
The correctness of the results has been ascertained by a comparison, using non-linear finite element models as well as experimental approach; and very good agreement has been obtained.
This has also been ascertained by a comparison of paleomagnetic directions for Mizunami with those for other areas in eastern Southwest Japan (Itoh et al. 2006).
Nevertheless, the speed ratio v is sufficiently small in both cases, which can be ascertained by the comparison between the standard deviation σ ¯ B and the one of our model with given v using Monte-Carlo simulations.
The identity of each of these pig defensins was ascertained by sequence comparisons and cysteine positions and spacing.
