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Relationship between Two Numerical Variables

Relationship between Two Numerical Variables. By Farrokh Alemi, Ph.D. Relationships. Investigators are often interested in relationship between variables. Anecdotal Data. Multiple observations needed. Anecdotal Data. I have smoked all my life and I do not have cancer. Relationships.

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Relationship between Two Numerical Variables

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  1. Relationship between Two Numerical Variables By Farrokh Alemi, Ph.D.

  2. Relationships Investigators are often interested in relationship between variables

  3. Anecdotal Data Multiple observations needed

  4. Anecdotal Data I have smoked all my life and I do not have cancer

  5. Relationships

  6. Independent X & Y

  7. Explanatory Variable

  8. Association Is Not Causation

  9. Causation Requires: • Association • Sequence (causes preceded effects) • Mechanism • Counter factual (no effect when causes are absent)

  10. Causation Requires: • Association • Sequence (causes preceded effects) • Mechanism • Counter factual (no effect when causes are absent)

  11. Causation Requires: • Association • Sequence (causes preceded effects) • Mechanism • Counter factual (no effect when causes are absent)

  12. Causation Requires: • Association • Sequence (causes preceded effects) • Mechanism • Counter factual (no effect when causes are absent)

  13. Association Is Not Causation

  14. Take Home Message A Scatterplot can show the association between two variables

  15. Do one:

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