Quantitative psychological research is defined as psychological research which performs mathematical modeling and statistical estimation or statistical inference or a means for testing objective theories by examining the relationship between variables. The first definition distinguishes it from qualitative psychological research; however, there has been a long debate on the difference between quantitative and qualitative research. It has been argued that because this debated has not found an end, the differences are enough that both quantitative and qualitative research is valuable in ways that both should be used in the gathering of data.
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“... research is never completed ... Around the corner lurks another possibility of interview, another book to read, a courthouse to explore, a document to verify.”
—Catherine Drinker Bowen (1897–1973)