The phrase "an efficient and valid" is correct and usable in written English.
It can be used when describing something that is both effective in achieving its purpose and acceptable or legitimate in a given context.
Example: "The research method we employed was an efficient and valid approach to gathering data."
Alternatives: "a reliable and effective" or "a sound and effective".
The parameter-based technique provides an efficient and valid means of constructing 3-D geometric models in many CAD software systems.
Hence, a careful selection of radio propagation models or channel models is necessary for an efficient and valid network design.
As a parent and teacher, I hope to see an efficient and valid process when dealing with teacher performance concerns.
In addition, we sought to devise an efficient and valid method to track students' learning in the PBL process.
Patient-Specific Functional Scale is an efficient and valid measure for assessing limitations in activities and change in limitations in persons with knee dysfunction.
A third objective is to devise an efficient and valid method to track students' learning as it unfolds in the course of the PBL process.
When assessing the empirical validity of the EQ-5D-3 L compared to the SF-6D, results showed that the SF-6D was an efficient and empirically valid alternative to the EQ-5D-3 L.
Thus, it provides a very efficient and valid tool to aid general practitioners in deciding whether patients with suspected cognitive impairments should be further evaluated or not ('watchful waiting').
Compared to review of clinical records, reported physical restraint use by interviewing nursing staff is a simple, efficient, and valid technique of collection of data regarding their use in nursing homes.
Interestingly, none of the measures of fish consumption (the most common source of organic Hg) were associated with U-Hg, suggesting that the measure of H-Hg was a more efficient and valid marker for organic mercury exposure.
We conclude that the Affymetrix 500 K GeneChip® Mapping Array can be used in SNP-MaP studies to provide an efficient, reliable, and valid genomewide screen of allele frequency differences between groups, thus facilitating the detection of SNPs of small effect size.
