If the variables are not quantitative we cannot do the arithmetic required in the formulas for r.
<h3>What is a variable?</h3>
A variable in mathematics is a symbol and placeholder for a changing quantity or any mathematical object.
A variable can specifically represent a number, a vector, a matrix, a function, a function's argument, a set, or an element of a set.
Quantitative order:
Quantitative methods emphasize objective measurements and statistical, mathematical, or numerical analysis of data gathered through polls, questionnaires, and surveys, as well as by manipulating pre-existing statistical data using computational techniques.
Ordinal-level measurement data can be quantitative or qualitative.
They can be arranged in ranked order, but differences between entries are meaningless.
Measurement data at the interval level are quantitative.
They can be arranged in any order, and meaningful differences between data entries can be calculated.
We can't do the arithmetic required in the r formulas if the variables aren't quantitative.
Therefore, if the variables are not quantitative we cannot do the arithmetic required in the formulas for r.
