The phrase "a valid addition" is correct and usable in written English.
You can use it when referring to something that is a legitimate or acceptable contribution to a discussion, argument, or list.
Example: "The new data provided by the research team is a valid addition to our findings and supports our hypothesis."
Alternatives: "a legitimate contribution" or "an acceptable enhancement."
As for the bulk-users, they view them as a valid addition to over-the-counter sales, arguing that they are read just as avidly by people who pick them up for free.
But Wavii's semantic search knowledge is also a valid addition to Google Knowledge, as it could further contextualize the information Google currently shows on the sidebar of most searches.
So maybe I am a valid addition to the canon.
The use of triple-target microarray experiments is a valid addition to the experiment design toolbox.
The results of likelihood ratio tests comparing each sequential model (Model 2.1 vs. 1.3 and Model 2.2 vs. 2.1; last column in Table 2) showed that the addition of each variable sequentially was a valid addition.
If the effectiveness of IL-1 is confirmed, then a short course of IL-1 inhibition may prove to be a valid addition to the therapeutic arsenal when the physician is confronted with complicated cases of gouty arthritis.
They are thus valid additions for future studies.
"Adjusting to illness" and "feeling alone" also appear to be valid additions to the PL as recommended by Graves et al. (2007) [ 26].
Before any of these alternatives may prove to be valid additions to current strategies, we are left with the possibility of better use of currently available vaccines.
There may still be cost implications for epidemiological studies that need to calibrate all error-prone covariates against a valid reference, in addition to the exposure, to reduce the effects of confounder measurement error.
The first condition ensures that we obtain a valid probability for the addition of new support points, P a (z)=η t (z,d), whereas the remaining three conditions imply that support points are more likely to be added in those areas where the proposal is further away from the target, with a non-null probability of adding new points in places where d>0.
