Child Development 133 
Research Methods in Human Development

Sections 04, 68, & 69
Hembree           Spring, 2011

 

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 (correlation coefficient)

 

 

 

 

II. Problems with interpreting correlations

A. restricted range

 

 

B. outliers

 

 

C. lack of reliability

 

 

D. correlation vs. causation

 

 

 

   

 

Send problems, comments or suggestions to: hembrees@csus.edu

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

Updated: January, 2011