The phrase "a comparison was established" is correct and usable in written English.
It can be used in contexts where you are discussing research findings, analyses, or evaluations that involve comparing two or more subjects or variables.
Example: "In the study, a comparison was established between the effectiveness of the two teaching methods."
Alternatives: "a comparison was made" or "a comparison was drawn".
A comparison was established with the conventional evaporative cooling methodology.
Additionally, a comparison was established among hole-drilling tests carried out with different deformation recording techniques.
A comparison was established among three zeolites (HFAU, HBEA and HZSM-5) having the same quantity of Brønsted acid sites but possessing different pore architectures.
A comparison was established between proteomic biomarkers for PE and the updated database of proteomic biomarkers for PCOS.
For each group a comparison was established between results at the first experimental day and after three days of consumption.
A comparison is established between three different ways to test the significance of the effects of the variables involved on the response signal.
Here a comparison is established between the case when the triggering mechanism is completely neglected and a series of cases where, in contrast, this effect is taken into account.
The laser power, frequency, pulse width and translation speed were the control parameters in both studies; hence a direct comparison was established between the model and the experimental results.
For example, in comparisons groups 366A-411A (CK), the comparison was established between BS366 and Jing411 grown under the same conditions of "A" and Jing411 was regarded as control.
No control group was used in this research, so comparison was established with known data from previous publications, mainly the favourable possibility of tumor resection after treatment.
Also, a performance comparison is established between the method proposed and Markovian-based prediction scheme.
