Src: https://stats.stackexchange.com/questions/159902/is-nominal-ordinal-binary-for-quantitative-data-qualitative-data-or-both
Nominal เรียกอีกอย่างหนึ่งว่า categorical
Discretization = quantization = the process of constraining an input from a continuous or otherwise large set of values (such as the real numbers) to a discrete set (such as the integers). เช่น แรงดัน 2.5 ถึง 5V. ให้ถือเป็น 1; Opposite is "nominal to numeric" process.
A cardinal number tells "how many." Cardinal numbers are also known as "
