Quantification produces a standardized form of measurement that allows statistical procedures and mathematical calculations. ... Thus, quantification is especially useful in describing and analyzing social phenomena on a larger scale.

Why do we quantify?

In mathematics and empirical science, quantification (or quantitation) is the act of counting and measuring that maps human sense observations and experiences into quantities. Quantification in this sense is fundamental to the scientific method.

Why do we need to quantify results?

We need to quantify the qualitative data into (statistical or mathematical models) to understand them, so as to draw conclusions, fit models generalize the results, etc.