Meta-analysis is a method to integrate a large body of related research literature systematically, including qualitative meta-analysis and quantitative metasynthesis, making the research more comprehensive, more rigorous, and more reliable, solving the problem about the similar study with contradictory results, to broad the study’s overall development. Quantitative meta-analysis is a method using statistical way to integrate a great deal of independent data of research, including hypothesis, search procedure, code and classification, data anal...
