Correlational Analysis Not all research uses an experimental design. Correlational analysis examines a number of instances and asserts, based on various initial assumptions (which we will examine in the section on Statistics: Correlation), that there is a co-relationship between variables.
Descriptive research methods are pretty much as they sound — they describe situations. They do not make accurate predictions, and they do not determine cause and effect. There are three main types of descriptive methods: observational methods, case-study methods and survey methods.
Descriptive science is a category of science that involves descriptive research; that is, observing, recording, describing, and classifying phenomena. Descriptive research is sometimes contrasted with hypothesis-driven research, which is focused on testing a particular hypothesis by means of experimentation.
Descriptive and interpretive approaches to qualitative research Robert Elliott and Ladislav Timulak Qualitative research methods today are a diverse set, encompassing approaches such as empirical phenomenology, grounded theory, ethnography, protocol analysis and dis-course analysis. By one common definition (Polkinghorne, 1983), all these methods rely on linguistic rather than numerical data ...
Quantitative research is rooted in numerical approaches. The emphasis is on objectivity and the use of statistics or data gathered through polls, questionnaires or surveys. With quantitative research methods, numerical data are gathered and then generalized across groups of people to explain trends or phenomena.
Regardless of this commonality, both types of review vary significantly. The following table provides a detailed explanation as well as the differences between systematic and literature reviews. Kysh, Lynn (2013): Difference between a systematic review and a literature review.