SOWK 459 Week 12: Quantitative Research Methods - Surveys and Quantitative Data Analysis

Quantitative Designs  Experiment Survey Program evaluation* Secondary data*  Qualitative Designs  Interview Focus group

Show examples of…  Questionnaire Data Collection Report

Gather data from all of the class

Classic Experimental Design  Experimental and control groups Random assignment Pretest and posttest  Variations  Posttest only (testing effects) Solomon four group design Using a comparison group

Nonequivalent comparison group design (true experiment, without random assignment) Natural experiments Ex post facto control group Time series Matching (Individual and Aggregate)

Static group comparison One-shot case study One-group, pre/posttest  Severe limitations

Internal vs. external validity Replication Threats to validity  Noncomparable groups Selection bias Placebo effect Researcher effects

Response rates and nonresponse bias Importance of creating a codebook

Univariate analysis  Measures of central tendency Frequencies   Bivariate analysis  Chi-square, t-test, ANOVA, and correlation   Multivariate analysis  Regression, MANOVA