Used and loved by millions
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
a proportion thereof
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "a proportion thereof" is correct and usable in written English.
It can be used in contexts where you want to refer to a part or share of something previously mentioned. Example: "The committee has allocated funds for various projects, and a proportion thereof will be directed towards community development."
✓ Grammatically correct
Science
News & Media
Alternative expressions(20)
a portion of it
part of the whole
a simplification thereof
a simulation thereof
a blend of these
a percentage thereof
a cocktail thereof
a lack thereof
any combination of the above
a fraction thereof
a version thereof
a range thereof
a simulacrum thereof
a consequence thereof
a portion thereof
a realization thereof
a factor thereof
a mix thereof
some combination of these
a copy thereof
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
3 human-written examples
Through chance expansion these mutations can be present in all copies of the mitochondrial genome (homoplasmy) or a proportion thereof (heteroplasmy).
Science
Whether a similar model applies to human disease, or even a proportion thereof where there is prominent entheseal involvement (<30% of PsA cases), has yet to be demonstrated.
It is conceivable that the 22 (or a proportion thereof) patients that are classified as having completed definitive β-lactam therapy may have received outpatient definitive non-β-lactam therapy after initial improvement.
Science
Human-verified similar examples from authoritative sources
Similar Expressions
57 human-written examples
Of course, the entire mosquito population (or even a large proportion thereof) will almost never become infected in a real system.
Science
In the case of substructure-based clustering, well established methods are existing for the generation of Maximum Common Substructures (MCS) which are present in all members of the structure population or a defined proportion thereof [2].
Science
More than half of the human genome consists of repetitive DNA and tandemly repeated DNA sequences comprise a significant proportion thereof.
Science
The proportion of S. Typhimurium strains that were DT104 and the proportion thereof that were found to be MDR are shown for each country in Table 2.
Science
Express a proportion or ratio with "a.
Wiki
Since the former is contributed to by all sequences within the population and the latter solely by a fraction thereof, the proportion of the total height of different peaks attributable to the baseline will be different.
Science
We investigate an idea that has surfaced recently in the literature (since 1999), namely that the proportion of node-positive lymph nodes (or a function thereof) is a much better predictor of survival than the number of excised and node-positive lymph nodes, alone or together.
Science
Figure 1 shows a demand and a possible quantization thereof.
Science
Expert writing Tips
Best practice
When using "a proportion thereof", ensure the context clearly defines what the 'thereof' refers to, avoiding ambiguity.
Common error
Avoid using "a proportion thereof" if the item being referred to (the 'thereof') is not immediately clear in the sentence or surrounding text. Rephrase to explicitly state what you are discussing.
Source & Trust
87%
Authority and reliability
4.1/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "a proportion thereof" functions as a post-modifying phrase, specifying a quantity or share of something previously mentioned. It serves to indicate that only a part of a previously referenced item is being discussed, as demonstrated by Ludwig.
Frequent in
Science
60%
News & Media
30%
Wiki
10%
Less common in
Formal & Business
0%
Encyclopedias
0%
Social Media
0%
Ludwig's WRAP-UP
In summary, "a proportion thereof" is a grammatically correct phrase used to indicate a part or share of something previously mentioned. While Ludwig AI indicates its acceptability, it's worth noting that this phrase is more formal and less frequent in everyday language. It is most commonly found in scientific and formal contexts, where precision is key. For less formal situations, consider using alternatives like "a part of that" or "some of it" to ensure clarity and naturalness.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
a portion of that
Uses 'portion' instead of 'proportion', indicating a part especially when divided or distributed.
a percentage of that
Replaces 'proportion' with 'percentage', focusing on a numerical share of the whole.
a fraction of it
Substitutes 'proportion' with 'fraction', implying a smaller or less precise part.
a share of that
Uses 'share' instead of 'proportion', suggesting a part allocated or belonging to someone or something.
a segment of it
Replaces 'proportion' with 'segment', which emphasizes a distinct section of the whole.
a certain amount of that
Replaces 'proportion' with 'amount', focusing on a specific quantity.
a quantity thereof
Uses 'quantity' which focuses on a measurable or countable part of the original.
some part of that
Emphasizes the indefiniteness of the quantity being referred to.
part of the whole
Replaces the original phrase with a more descriptive and less formal expression.
a piece of it
Uses 'piece' instead of 'proportion', suggesting a fragment or detached portion.
FAQs
How can I use "a proportion thereof" in a sentence?
Use "a proportion thereof" to refer back to a previously mentioned whole, indicating that you're discussing a part or share of that whole. For example, "The budget was allocated to several departments, and "a proportion thereof" was used for research."
What's a more common way to say "a proportion thereof"?
While grammatically correct, "a proportion thereof" can sound formal. Simpler alternatives include phrases like "a portion of that", "a fraction of it", or simply "part of it" depending on the context.
Is "a proportion of it" the same as "a proportion thereof"?
Yes, "a proportion of it" and "a proportion thereof" are largely interchangeable. The latter is slightly more formal and less commonly used in everyday speech. In most contexts, using "a portion of it" will sound more natural.
When is it best to use "a proportion thereof" over other alternatives?
Use "a proportion thereof" in formal or scientific writing where precision and conciseness are valued. In less formal contexts, alternatives like "a part of that" or "some of it" may be more appropriate.
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
87%
Authority and reliability
4.1/5
Expert rating
Real-world application tested