The book that established itself as a standard text and reference work for students seeking to master research methods and procedures in psychology has been updated and revised in this new edition! The Second Edition of The Psychology Research Handbook: A Guide for Graduate Students and Research Assistants once again offers a comprehensive guide for understanding and conquering the entire research process. Editors Frederick T. L. Leong and James T. Austin have assembled a distinguished group of expert researchers who share skill sets accumulated as a result of years of practical exposure to the design, development, implementation, and documentation of research in psychology.

Cleaning up Data and Running Preliminary Analyses
Cleaning up data and running preliminary analyses
David L.DiLallaStephen J.Dollinger

The literature has been reviewed; the study has been planned; the data have been carefully collected and entered. At this point, it's often tempting (for students as well as seasoned researchers) to dive into data analysis to see whether one's hypotheses have been supported. Tempering the temptation is the GIGO principle: Garbage In, Garbage Out. The integrity of a single scientific investigation, of a clinical case study, and of the entire field depends on data sets that are as internally valid and free of error as we can make them. Preliminary analyses serve this end by helping identify several sources of error. Of course, this effort to avoid error begins ...

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