Child Development 133 
Research Methods in Human Development

Sections 02 & 06
Hembree            Fall, 2009


  Correlational Research

I. Correlational strategies

A. Design issues - correlational vs. experimental strategies





B. Correlation Coefficients

1. Scatterplots




2. Positive and Negative (inverse) linear relationships






3. Curvilinear relationships





4. Calculating Pearson r/ testing for statistical significance





II. Problems with interpreting correlations

A. restricted range



B. outliers



C. lack of reliability



D. correlation vs. causation




III. Multiple variables

A. Partial correlations




B. Multiple regression






Send problems, comments or suggestions to:

California State University, Sacramento
College of Education
Department of Child Development

Updated: August, 2009