The phrase "are a valid means" is correct and usable in written English.
You can use it when discussing methods or ways of achieving something that are considered acceptable or legitimate.
Example: "In this study, we demonstrate that these techniques are a valid means of improving data accuracy."
Alternatives: "constitute an acceptable method" or "serve as a legitimate way".
The supposed definition of "racial profiling" — that the alleged behavior of any fragment of a population becomes the basis for categorizing it in its sum, that epidermal hues are a valid means of reflexively predicting character — is what we, in more honest moments in our past, simply referred to as racism.
Two-day diet records are a valid means of measuring food and nutrient intakes [17].
Northern Irish banknotes are a valid means of payment in Northern Ireland and England, but again shops don't have to accept them.
LSMDs are a valid means of defining sub-groups within non-specific LBP, in a conservative care population of patients with RCLBP.
France's constitutional court has upheld a ban on hydraulic fracturing, ruling that the law against the energy exploration technique known as "fracking" is a valid means of protecting the environment.
In the cut bamboo experiments, we found that Fd measurement using a 10 mm probe was a valid means of determining the water-use behavior of a Moso bamboo, although a specific correction was needed.
Lossy JPEG (15:1) compression is a valid means for reducing storage and exchange requirements of coronary angiographic data.
PURPOSE: We studied whether subjective impression of vein size is a valid means of assessment during sonographic evaluation for deep vein thrombosis.
SIGNIFICANCE: The WFR of median nerve area promises to be a valid means of diagnosing CTS, and may be superior to measuring median nerve area at the wrist alone.
This test is a valid means for assessing upper body strength in the elderly [ 22, 51].
The 1RM leg press test is a valid means to assess leg muscle strength in elderly men and women [ 50].
