"Quantitative data is information about quantities, and therefore numbers, and qualitative data is descriptive, and regards phenomenon which can be observed but not measured, such as language.
...
Quantitative research gathers data in a numerical form which can be put into categories, or in rank order, or measured in units of measurement. This type of data can be used to construct graphs and tables of raw data." - SimplyPsychology.org
Methods may include: controlled observations and questionnaires.
These are just a few selected resources. If you are struggling to find more, try using Library of Congress Subject Headings to narrow your search. Some suggested terms include:
Psychometrics
Psychometrics-- History
Measurement, Psychological
Psychological measurement
Psychological scaling
Psychological statistics
Psychology--Measurement
Psychology--Methodology -- History
Psychology--Scaling
Scaling, Psychological
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