The phrase "a valid primary" is correct and usable in written English.
It can be used in contexts where you are discussing something that is considered a legitimate or acceptable primary option, such as in research, data analysis, or decision-making.
Example: "In our study, we identified a valid primary source that supports our hypothesis."
Alternatives: "an acceptable primary" or "a legitimate primary".
On the other hand, low-blocking-point minerals from a rock containing minerals indicative of high temperatures and pressures cannot give a valid primary age.
Remarkably, the isotopes remain within the rock sample analyzed, and so a suite of whole rocks can still provide a valid primary age.
I had not always — had not even long — been a daylight ghost, a layabout, a mal pensant, a vacancy, a housewife, a person foiled by the challenge of getting dressed and someone who considered eating less a valid primary goal.
A rock formed at the surface with no indication of deep burial or new mineral growth can be expected to give a valid primary age by virtue of minerals with low blocking temperatures.
In such a scenario, OS remains a valid primary efficacy end point.
By combining the eight plasma experiments as listed in Table 1 and after removal of redundancy, we identified 1193 distinct proteins with a valid primary accession number.
According to the recommendation of a recent consensus conference of the AASLD and the EASLD, TTP is chosen as a more valid primary end-point.
The instrument appears to be a practical, valid primary screening test for heavy drinking and/or active alcohol abuse or dependence [ 12].
From a total of 27 valid primary attributes (rows 1 to 28), 16 have moderate to substantial statistically significant intermethod BCa Kappa values.
If we cannot find an ideal magenta, a valid split primary would be two magenta's, one tending toward purple, the other toward red, PV19 and PR122 for example.
A total of 4603 students provided complete and valid primary outcome data in both 6th and 8th grade.
