The phrase "as a valid substitute for" is correct and usable in written English.
You can use it when discussing alternatives or replacements for something, indicating that the alternative is acceptable or appropriate.
Example: "You can use olive oil as a valid substitute for butter in this recipe if you prefer a healthier option."
Alternatives: "as an acceptable replacement for" or "as a legitimate alternative to".
In the past few years, collagen matrices (CM) have been studied as a valid substitute for free gingival grafts, in particular the porcine CM Mucograft (Geistlich Biomaterials GmbH, Baden-Baden, Germany).
Several studies have concluded that the available measures of Me were not sufficiently accurate as a valid substitute for a permutation procedure (Han et al. 2009; Salyakina et al. 2005; Galwey 2009).
The equation, with the use of routine biochemical variables, needs to be confirmed in free-living populations but can be recommended as a valid substitute for the direct measurement of serum osmolality in existing data sets and could usefully be used to screen for current dehydration in clinical situations.
Therefore the use of sheep suppressively treated with effective anthelmintics appears to be a valid substitute for gastrointestinal nematode-free lambs in field experiments.
This study reported that oral fluid was a valid substitute for serum sampling for patients on chronic oral morphine therapy.
With an accuracy of 92%, it can represent a valid substitute for traditional approaches, which are costly, time-consuming, and potentially unreliable.
Two Norwegian studies have shown that CDR staging is a valid substitute for a dementia assessment among nursing-home patients to rate dementia and dementia severity [ 60, 61].
How confident we must be that a surrogate endpoint is a valid substitute for the endpoint of primary interest is debated [ 44, 45].
Two Norwegian studies have shown that CDR staging is a valid substitute for dementia assessment among nursing-home patients, to rate dementia and dementia severity.
It's apparently a very old idea going back thousands of years, and we know that in pseudoscience circles age is a perfectly valid substitute for "evidence that is actually works".
However, for healthcare researchers around the world who did not have a readymade CMI at hand, the search for a valid substitute has always been a painstaking process.
