Number, Numeric, Quantity
Table of Contents
1 - About
A number is a mathematical object used to:
- and measure.
Example: When we are interested in the total number of each species of tortoise, or how many individuals there are per square kilometre.
This type of data is called commonly:
- numerical data
- or quantitative data.
The same number may be:
2 - Articles Related
3 - Why
4 - Notion
4.1 - Number System
Numbers can be classified into set, called number system.
The most common number system (ie number classification) are:
4.2 - Numeral System
Numbers can be expressed (ie written) into set, called numeral system (or system of numeration). It is a mathematical notation system for expressing numbers using digits (or other symbols).
Example of numeral system (ie number representation)]]:
4.3 - Number Storage
Numbers can be stored in:
- truncated at some satisfactory size
- or else rational numbers would be used: a large integer for the numerator and for the denominator. But even with the greatest common divisor divided out, arithmetic with rational numbers can become unwieldy very quickly: 1/99 – 1/100 = 1/9900, and if 1/101 is then added the result is 10001/999900.
4.4 - Field
A field is a collection of “numbers” with their operator: +, -, *, /
4.5 - Discrete / Continous
Quantitative variables can be further categorized as either: