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The phrase "a valid approximation to" is correct and usable in written English.
It can be used when discussing estimates or representations that are close to a true value or concept in various fields such as mathematics, science, or engineering.
Example: "The formula provides a valid approximation to the actual measurements taken during the experiment."
Alternatives: "an accurate estimate of" or "a reliable representation of".
Exact(2)
Thus, Newton's theory is not incorrect; rather, it constitutes a valid approximation to general relativity under certain conditions.
Therefore, adolescent smoking self-report constitutes a valid approximation to assess smoking behaviour.
Similar(57)
The averaging is a valid approximation, because the MFPT to ∂Ω i is constant to begin with (except in a negligible boundary layer).
This suggests that our theory can identify the reduction steps that lead to a valid approximation (e.g. ER model).
The objectives of this review were: to validate whether a linear relationship between effective coverage in a subpopulation and RR of symptomatic influenza infection in the non-vaccinated population forms a valid approximation for herd effect; and to identify point estimates of this relationship, expressed as RR as a function of effective coverage in children.
The "Talk Test" (cycling at an intensity at which a conversation was possible) was used to prescribe cycling intensity and has been shown to be a valid approximation of ventilatory threshold [27].
The Hillson and Rideal expression is shown to be a valid approximation when illumination of the electrode only slightly perturbs the electrodic charge-transfer reactions.
The persistent obstacle in such processes is to find a valid approximation for soil representation.
This is known to be a valid approximation in mean field neural network analysis, but may fail when precise timing and details of the dynamical aspects of the neuron affect the inhibition [57], [58].
As long as single-file transport is a valid approximation, our model can be extended to include the interaction of several particles within the channel by adapting the condition of conserved probability in Eq. (9) for the maximum number of particles occupying the channel.
We assumed relative risks to be a valid approximation of hazard ratio, 21 enabling the use of one consistent measure.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com