The phrase "a clean comparison" is correct and usable in written English.
It can be used when discussing a comparison that is clear, straightforward, and free from ambiguity or unnecessary complexity.
Example: "In order to evaluate the two products effectively, we need to make a clean comparison of their features and prices."
Alternatives: "a clear comparison" or "a straightforward comparison".
The reason to prevent patients in the chemotherapy group from subsequently getting PLX4032 was to ensure a clean comparison.
To achieve a clean comparison between the two types of auditors, we remove from the database the financial statements that instigated the ICAC inspection and those supervised by sanctioned auditors in the post-inspection period.
Then, after NASA and SpaceX – the Hawthorne, Calif.-based firm that built and launched the rocket — bring the capsule back via splashdown in the Pacific Ocean, they'd send the experiment back East, where Warren would be able to contrast the astronauts' results to his own, creating a clean comparison.
Some trials also allowed patients in the control group to receive physiotherapy intervention after this point, so this primary analysis allowed a clean comparison of physiotherapy intervention versus no intervention.
Zultan et al., (2012) introduced two asymmetric team games to allow for a clean comparison of the effect of one group member's outcome on the responsibility attributed to another.
While previous studies have shown that this student-centered method can be more effective than teacher-led instruction, Wieman says this study attempted to provide "a particularly clean comparison... to measure exactly what can be learned inside the classroom".
Only once during the Lakers game did we glimpse a clean, satisfying comparison of the efficient strategy and the inefficient one — that is, an outcome that reflected the odds.
But for purposes of doing a clean profitability comparison, gross margin or the popular measure of earnings before interest, taxes, depreciation and amortization (EBITDA)–does the trick.
Lastly, in order to create clean comparison cohorts, patients receiving both palonosetron and any of the "other" 5-HT3 Ranyany time during the course of one or more chemotherapy treatment cycles were excluded from the analysis.
