Hayashi's Quantification Theory

Abstract

Chikio Hayashi conceived of quantification to convert qualitative variables into quantitative variables, developed the necessary quantification theory systematically and independently, and took a leadership role in solving social problems supported by quantification theory. Quantification theory and survey design based on its application have taken root in all social analysis activities in industry, government, and academia in Japan as a method for analyzing and improving qualitative variables that are routinely collected and that are factors in behavior. Quantification theory has become a representative methodology for multivariate data analysis proposed by Japan, and has also made a pioneering contribution to the international community in the construction of Data Sciences. For these reasons, the Japanese Society of Applied Statistics recommends “Hayashi's Quantification Theory” for the Kototsukuri Collection.