Levels of Measurement

• Difference 


  Data that investigates this will most typically have two conditions, one control condition and one experimental condition
• Association 


  The psychologist would be investigating the relationship between the two co-variables
• Nominal data 


  Categorical data
• Ordinal data 


  subjective data, opinions
• Interval data 


  Refers to how the data is ordered in some way like heart rate, blood pressure, weight