Part of the work of quantitative historical research is to find a suitable quantity to reflect the past. For example, height data can just take on such a role in historical research, especially economic history research. There are many factors that affect height at the individual level. At the social level The average height is closely related to the standard of living in an individual's adolescence. Height will be shaped at a certain age and will not change much until old age. Height is equivalent to "freezing" past socioeconomic conditions, although there is no Amber is so accurate at anchoring bugs, it is precious. What does the author mainly want to explain through this text? ['How does socioeconomic status affect human height?', 'Economic history research can refer to human physical data.', 'How to select appropriate parameters for quantitative historical research.', 'Height data frozen socio-economic conditions.']