Correlation

• Association of two variables called covariables
• Positive correlation

  Both covariables increase
• Negative correlation

  As one increases the other falls
• Pros

  • Provides precise, quantifiable measure on how related
  • Relatively quick and economically easy, no need for controlled environment or no manipulation of data
  • Assess patterns
• Cons

  • Tells variables are related, but not why
  • Cannot tell us the cause and affect between variables therefore don’t know what variable causes what