According to the American Psychological Association, Quantitative psychology is the study of methods and techniques for the measurement of human attributes, the statistical and mathematical modeling of psychological processes, the design of research studies, and the analysis of psychological data.
Want to learn more?
This link to the American Psychological Association website provides basic information about Quantitative Psychology as well as ways to prepare for a degree and the task force in this field:http://www.apa.org/research/tools/quantitative/index.aspx?item=1
(be sure to explore the links on the right-hand side of the page)
You can also check out APA's Evaluation, Measurement, and Statistics page to become a Division 5 member (for access to exchange of scientific information and professional contacts)