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
categorized into three classes
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "categorized into three classes" is correct and usable in written English.
It can be used when describing the organization or classification of items, concepts, or data into three distinct groups. Example: "The animals in the study were categorized into three classes: mammals, reptiles, and birds."
✓ Grammatically correct
Science
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
58 human-written examples
The occupancy status is categorized into three classes: away, active, and inactive (sleep).
Science
CircRNAs can be categorized into three classes based on their origination.
Science
From a particular viewpoint, models could be categorized into three classes: white box, black box, and gray box models.
Science
The methods can generally be categorized into three classes: finite difference, binomial lattice methods, or Monte Carlo simulation.
Facial shape representation can be categorized into three classes, namely: local features representation, global feature representation and hybrid representations.
These lipases are highly diverse and are categorized into three classes on the basis of oxyanion hole: GX, GGGX and Y.
Science
The planar manipulators are categorized into three classes with further several sub-classes based on link lengths in terms of joint angle ranges.
Science
The sub-watersheds were then categorized into three classes as high (2.3 3.00), medium (3.25 3.75) and low (4.12 4.62) priority.
Science
From the viewpoint of human aid, SVC methods can be categorized into three classes: manual, semi-automatic, and fully automatic [4].
Human-verified similar examples from authoritative sources
Similar Expressions
2 human-written examples
The 569 images in the dataset are categorized into two classes: benign and malignant.
Generally, the anti-collision protocols are categorized into two classes: aloha-based and tree-based protocols.
Expert writing Tips
Best practice
When using "categorized into three classes", ensure that each class is clearly defined and mutually exclusive to avoid ambiguity.
Common error
Avoid defining categories that overlap or lack clear distinction. Ensure that each item can be unambiguously assigned to one, and only one, of the three classes.
Source & Trust
81%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "categorized into three classes" functions as a descriptive phrase, indicating a classification or grouping method. It's typically used to clarify how a set of items or data has been organized for analysis or presentation, as confirmed by Ludwig.
Frequent in
Science
100%
Less common in
News & Media
0%
Formal & Business
0%
Encyclopedias
0%
Ludwig's WRAP-UP
The phrase "categorized into three classes" is a common and grammatically correct way to describe how items are grouped. As Ludwig suggests, it's frequently used in scientific and academic contexts to provide clarity and structure. Alternatives include phrases like "divided into three categories" or "classified into three groups". When using this phrase, ensure each class is clearly defined to avoid ambiguity. The high frequency and source authority suggest that it is a reliable and accepted expression in formal writing.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
divided into three categories
Replaces "categorized" with "divided" and "classes" with "categories", maintaining the core meaning.
classified into three groups
Substitutes "categorized" with "classified" and "classes" with "groups", resulting in a slight variation in formality.
grouped into three types
Replaces "categorized" with "grouped" and "classes" with "types", offering a slightly less formal tone.
sorted into three kinds
Focuses on a process of sorting based on kind rather than a predefined categorization.
separated into three divisions
Uses "separated" instead of "categorized" and "divisions" instead of "classes", suggesting a more physical or distinct separation.
organized into three sections
Emphasizes arrangement rather than inherent categories by using "organized" and "sections".
arranged into three segments
Similar to organized, this highlights a structured layout with "arranged" and uses "segments" to denote parts.
split into three parts
Indicates a division into literal parts or components using the verb "split".
sectioned into three tiers
Suggests a hierarchical structure using "sectioned" and "tiers".
distributed into three sets
Implies an allocation or assignment into distinct sets, not necessarily based on inherent properties.
FAQs
What does it mean to be "categorized into three classes"?
When items are "categorized into three classes", it means they are grouped into three distinct categories based on shared characteristics or criteria.
How can I use "categorized into three classes" in a sentence?
You can use "categorized into three classes" to describe how data or items are organized, such as, "The survey responses were "categorized into three classes": satisfied, neutral, and dissatisfied."
What are some alternatives to "categorized into three classes"?
Alternatives include "divided into three categories", "classified into three groups", or "grouped into three types".
In what contexts is "categorized into three classes" most commonly used?
"Categorized into three classes" is frequently used in scientific and academic writing to describe classifications of data, objects, or phenomena. It is a formal way to explain organization, as Ludwig suggests.
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
81%
Authority and reliability
4.5/5
Expert rating
Real-world application tested