The phrase "a valid and efficient" is correct and usable in written English.
You can use it when describing something that is both acceptable or legitimate and effective in achieving its purpose.
Example: "The proposed solution is a valid and efficient method for improving our workflow."
Alternatives: "a legitimate and effective" or "a sound and productive".
In sum, the SGA can be recommended as a valid and efficient observation-based instrument to identify critical work-related risk factors.
The results demonstrate that the method proposed in this paper is a valid and efficient design tool for controlling smoke in UTLTs.
We conclude that stable individual differences in general motor activity, possibly indicating differences in temperament, are present in kittens early in development, and that ranking the degree of such behaviour in a naturalistic setting provides a valid and efficient method of detecting such differences.
It is a valid and efficient tool with 7 items for screening for generalized anxiety disorder.
Our findings support the view that the nested case-control study is a valid and efficient design for diagnostic studies.
We believe that the case-referent approach offers a valid and efficient methodological framework for estimating the impact of service screening programmes in the routine healthcare environment (Verbeek and Broeders, 2010).
Consequently, the "top-level experiments" of the simulation model can assess the research questions in a more valid and efficient way.
The CIDI-O is a standardized computer-based interview which enables the diagnosis of mental disorders according to the ICD-10 and DSM-IV in a reliable, valid and efficient manner.
There was consistent evidence that the SF-6D is an empirically valid and efficient alternative to the EQ-5D-3 L.
This study provides evidence that the SF-6D is an empirically valid and efficient alternative multi-attribute utility measure to the EQ-5D, and is capable of discriminating between external indicators of maternal health.
In conclusion, this study provides evidence that the SF-6D is an empirically valid and efficient alternative multi-attribute utility measure to the EQ-5D, and is capable of discriminating between external indicators of maternal health.
