The phrase "a valid index of" is correct and usable in written English.
It can be used when discussing a measure or indicator that accurately reflects or represents something else.
Example: "The survey results serve as a valid index of customer satisfaction within our company."
Alternatives: "an accurate measure of" or "a reliable indicator of".
Circulating levels of adhesion molecules have been regarded as a valid index of endothelial activation.
Like many other professors, he no longer sees traditional term papers as a valid index of student competence.
This consistency between variations of the PDR and orienting response's properties indicates that the PDR is a valid index of the auditory orienting response.
This peripheral cholinergic sign was tightly correlated with in vitro anti-acetylcholinesterase activity by cholinesterase inhibitors, suggesting that fasciculation is a valid index of peripheral cholinergic activation.
The shear modulus is a measure of the ability of a material to resist transverse deformations and is a valid index of elastic behaviour only for small deformations, after which the material is able to return to its original configuration.
An important assumption of our approach is that heart rate provides a valid index of developmental rate.
Fourth, the use of an ethical guideline for dealing with Jehovah's Witnesses may not serve as a valid index for adequate functioning of a committee.
In several large adult cohort studies, AVR has been shown to be a valid index for an increased risk of hypertension, stroke and higher cardiovascular mortality [ 41, 42].
VAS was proven as a valid index for experimental and clinical assessments of chronic pain [ 12].
Where the observed index sequence differed by one nucleotide change from a valid index, the nearest valid index was assigned, except for a small number of sequences (<200) that differed by one nucleotide change from two valid indexes; these read pairs were not assigned an index.
Overall, our results provide a significant first step in demonstrating that a classic cognitive neuroscience measure can be adapted to serve as a reliable and valid index of variation in creative abilities.
