PSYC 2001 Lecture Notes - Lecture 19: Meta-Analysis, Internal Validity
Document Summary
Replication: about repeating a study, scientific research, it is important to have many studies that represent an idea. If we have many studies, it becomes more powerful. It works on the principle of replication: gives us an effect size, a lot of consumers get information from the popular press, they are less concerned with replicability. If you approach the concepts the same but measure them differently and still get the same results you can be confident that something is there: replication plus extension, future research that adds variables into an existing study. It speaks to generalizability, applying the findings to the population of interest. A lot of the studies that were null (no effect) or the reverse of what the researcher expected to find do not get published: all the studies, do we have a strong and large effect. In order to achieve external validity: who is your population of interest.
