The phrase "a valid comparison between" is correct and usable in written English.
You can use it when discussing the legitimacy or appropriateness of comparing two or more subjects, ideas, or items.
Example: "In her essay, she made a valid comparison between the economic policies of the two countries."
Alternatives: "a legitimate comparison of" or "an appropriate comparison between".
A valid comparison between different structures can be achieved by comparing normalised B-factors instead.
Therefore, this system is need to make a valid comparison between the algorithms employed.
To allow for a valid comparison between customers with and without social media interactions, we report the specific costs of these interactions separately, again using data from internal accounting.
However, it provided a valid comparison between MSM and heterosexual men regarding gym practices.
Availability of a large data sample allowed for a valid comparison between different definitions of frequent attendance.
There were insufficient NGOs and participant numbers within NGOs to make a valid comparison between NGO and government organizations.
It was noted in that news article, however, that soybean varieties differed so a valid comparison of emergence between treated and untreated seed was not possible.
Therefore, it is very difficult to perform a valid comparison of precision between the GCP and the ICPs.
The actual gain in a student's score is divided by the maximal possible gain, ((posttest – pretest)/(100 – pretest) × 100), which allows a valid comparison of gains between students with different pretest scores.
A valid comparison of outcomes between hospitals or healthcare providers (benchmarking) requires adjustment for severity of the health condition of patients and the performed interventions, often referred to as case-mix differences.
However, past experience informs us that as the procedures and sample months are equivalent, and replacement of one procedure by another provides a degree of compensation, this enables a valid comparison to be made between the two surveys.
