The phrase "a valid index" is correct and usable in written English.
It can be used in contexts related to data structures, databases, or any situation where an index is being evaluated for its correctness or appropriateness.
Example: "In order to retrieve the data efficiently, we need to ensure that we are using a valid index for our queries."
Alternatives: "an acceptable index" or "a proper index".
Like many other professors, he no longer sees traditional term papers as a valid index of student competence.
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.
Circulating levels of adhesion molecules have been regarded as a valid index of endothelial activation.
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 number of family members, their ages and the amount of time they spend at home are detected as important factors, so that a valid index could be determined from the consumption ratio per inhabitant and hours stayed at home.
Future research could explore these different kinds of algorithms for operationally defining interdisciplinarity to move toward a relatively valid index.
Our results do not support the validity of the MCCI as a predictor of the short-term outcomes in elderly stroke patients nor could we develop a more valid index from the available data.
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.
Our data suggest that the NVPQOL is a reliable and valid index to measure NVP-specific QOL in the first trimester of pregnancy.
Our results confirm that the NVPQOL is a reliable and valid index to measure NVP-specific QOL and that it is well suited for use during the first trimester of pregnancy.
