Written by Professor William M.K. Trochim, The Research Methods Knowledge Base is a comprehensive web-based textbook that addresses all of the topics in a typical introductory undergraduate or graduate course in social research methods.
It covers the entire research process including: formulating research questions; sampling (probability and non probability); measurement (surveys, scaling, qualitative, unobtrusive); research design (experimental and quasi-experimental); data analysis; and, writing the research paper. It also addresses the major theoretical and philosophical underpinnings of research including: the idea of validity in research; reliability of measures; and ethics.
The Knowledge Base was designed to be different from the many typical commerciallyavailable research methods texts. It uses an informal, conversational style to engage both the newcomer and the more experienced student of research.
Research Methods Knowledge Base
Psychology 101: Research and Data Analysis in PsychologyOnline course lectures provided as a study resource for students which are also freely available to the public.
Research and Data Analysis in Psychology
Concepts and Applications of Inferential Statistics is a free, full-length, and occasionally interactive statistics textbook by Richard Lowry, Professor of Psychology Emeritus, Vassar College, Poughkeepsie, NY, USA.
Concepts and Applications of Inferential Statistics
Resource maintained by Professor Alan Reifman from Texas Tech University which provides links to public domain questionnaires (including items and scoring keys) which can be used freely for research purposes.
Questionnaire Instrument Compendium