Taken from: Jordan and Neimeyer (2003)
A Qualitative (or narrative) literature review involves a scholarly analysis of the existing literature, from which the reviewer draws reasoned conclusions about the state of knowledge in a given area of inquiry.
A Quantitative review (or meta-analysis) is a statistical technique (or group of techniques) that allows objective data from many different studies to be combined to produce a numerical answer to the question, ‘‘How effective is a particular type of treatment?’’
- Resulting measure EFFECT SIZE: standardized way of assessing to what degree people who receive the treatment do better on outcome measures than people who do not receive the treatment
- General effect size for psychotherapeutic treatments 0.8 = 80% of people receiving treatment better after treatment than those who do not receive treatment