The phrase "a proper comparison" is correct and usable in written English.
You can use it when discussing the appropriateness or accuracy of a comparison between two or more items, ideas, or concepts.
Example: "In order to evaluate the effectiveness of the two marketing strategies, we need to make a proper comparison of their results."
Alternatives: "an appropriate comparison" or "a valid comparison".
"One is natural, one is a processed product, so it's not a proper comparison".
She also suggested that the opinion failed to make a proper comparison of biofuels and gasoline or diesel.
And he has experienced the worst that the N.B.A. has to offer, although he had to reach back four decades to make a proper comparison.
In Hanley's judgment, the impression lacked the kind of detail — the clear ridges and furrows — that is necessary to make a proper comparison.
Furthermore, as the Chartered Institute of Housing showed in June, the official figures don't give a proper comparison over a series of years.
What my colleagues determined was that we could reduce past errors in the ocean heat content (OHC) record by correcting systematic measurement biases, filling in gaps where no information is available, and by choosing a proper comparison climate.
Ms. Holzner said that the main problem with Mr. Searchinger's work on biofuels for transportation was that he had failed to make a proper comparison with the emissions produced by gasoline and diesel burned in cars.
Many impedance measurements are carried out to draw a proper comparison between the proposed solutions.
This means it only measures the change in the price of properties that have been sold before, to ensure a proper comparison.
Due to the limitations in this closed-form solution in Equation (6), a proper comparison of the proposed PSO with this PHY layer solution is generally not possible.
In the same way, it allows a proper comparison of products, even in the case of products that are very far from a technical point of view.
