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Extra resources for Best Practices in Data Cleaning: A Complete Guide to Everything You Need to Do Before and After Collecting Your Data
This last point argues for more use of meta-analysis (studies that statistically summarize the results of many other studies, which few would argue with). Yet meta-analysis is only possible after a good number of original studies of high quality have been performed. While there is a robust literature on generalizability in the sciences, let us start with some basic assumptions. First, researchers want to do the best job they can in matching a sample to a target population. Second, the match will never be perfect.
Journal of Counseling and Clinical Psychology, 58(5), 646–656. Rutstein, D. D. (1969). The ethical design of human experiments. Daedalus, 98(2), 523–541. Schmidt, F. (1996). Statistical significance testing and cumulative knowledge in psychology: Implications for training of researchers. Psychological Methods, 1(2), 115–129. , & Gigerenzer, G. (1989). Do studies of statistical power have an effect on the power of studies? Psychological Bulletin, 105(2), 309–316. THREE BEING TRUE TO THE TARGET POPULATION Debunking the Myth of Representativeness Often ours seems to be a science of just those sophomores who volunteer to participate in our research and who also keep their appointment with the investigator.
For example, if I am testing a new drug on patients and comparing them to placebo or control groups, I want to be very sure that new drug is actually producing significant differences before recommending doctors prescribe it. Likewise, we want to be relatively certain that a psychological or educational intervention will produce the desired differences over existing interventions prior to recommending implementation. 05) was more flexible. 05, meaning that we give ourselves only a 5% chance of making a Type I error in our decision making.