Read our course presentations, handouts and other materials and basic introduction into logic of descriptive, bivariate and simple multivariate statistics:
Babbie, Earl. 1995. The Practice of Social Research. Wadsworth Publishing; 7 edition.
Elementary Analyses Chapter 15, Pp. 375-394 (descriptive statistics, groups comparison, bivariate analysis)
The Elaboration Model Chapter 16, Pp. 395-412 (multivariate analysis, logic of elaboration)
Elaborating bivariate relationships (pp. 161-170) in de Vaus, D., A. 1985. Surveys in Social Research, First Edition, Hemel Hempstead/Winchester, Mass. : Allen & Unwin Ltd. (excellent simple examples of multivariate analysis with 2x2x2 tables and principle of elaboration) This is highly recommended text.
Cross-tabulations and More on tables (selected parts of chapters 1 and 2) in Treiman, D. J. 2009. Quantitative data analysis: doing social research to test ideas San Francisco: Jossey-Bass. (excellent comment and examples of interpreting crosstabulation, elaboration, interaction/additive effects) This is highly recommended text.
Quantitative data analysis Chapter 14 in Bryman, A. 2008. Social research methods. Oxford: Oxford University Press. online resources (data, tests) (descriptive statistics as well as testing hypothesis)