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Speaking of cluster analysis , it is well known that multidimensional data is used as an analysis of sample grouping .
It can be used for the same purpose in one dimension, but in one dimension, it can also be used to convert quantitative data into qualitative data as a method of feature engineering .
If you are limited to the method of converting quantitative data into qualitative data , the one-dimensional clustering method may be simpler than the method known as cluster analysis . This page explains how to do that, and the last one that uses cluster analysis.
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Example of R is in the page, Variable conversion by R .
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Vector quantization
