Simple Slopes Analysis Example
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Simple Slopes Analysis Example Presentation Transcript

  • 1. blog.emergitect.com Chatzisarantis, Hagger (2007) Mindfulness and the Intention-Behavior Relationship Within the Theory of Planned Behavior Simple Slopes Analysis via Mplus Simulations Rediscover your Inner Statistician Stefano Picozzi March 2013 blog.emergitect.com
  • 2. blog.emergitect.com Agenda •  Background •  Hypotheses •  Exploratory Data Analysis •  Simple Slopes •  Summary •  Application •  Model re-specified
  • 3. blog.emergitect.com Background •  The theory of planned behavior is a social cognitive model that explains how deliberative decisions, that is, effortful decisions that involve a consideration of the advantages and disadvantages of the target behavior prior to action (Fazio, 1990), influence performance of social behavior (Ajzen, 1991). •  However, it also has been demonstrated that the correlation between intentions and behavior is modest. Meta-analyses have revealed that intentions account for a weighted average of only 30% of the variance in social behavior (Armitage & Conner, 2001; Hagger et al.,2002), mainly because people with strong intentions fail to act on them (Orbell & Sheeran, 1998).
  • 4. blog.emergitect.com Theory of Planned Behavior •  The theory posits that performance of social behavior is a function of three variables: attitudes (positive or negative evaluations regarding behavioral performance), subjective norms (perceived influences that significant others may exert on the execution of behavior), and perceived behavioral control (perceptions of control with respect to the performance of social behavior; Ajzen, 1991). The theory also proposes that the attitudes, subjective norms, and perceived behavioral control influence behavioral engagement indirectly via intentions. Ajzen (1991)
  • 5. blog.emergitect.com Study 1 •  Examined moderating effects of mindfulness on the intention-behavior relationship in the context of physical exercise •  H1: the intention behavior relationship would be stronger among individuals who acted mindfully than among individuals who did not •  H2: habit would moderate the intention- behavior relationship such that the intention- behavior relationship would be stronger among non-habitual exerciser than among habitual exercisers
  • 6. blog.emergitect.com Study 2 •  Investigated utility of mindfulness in protecting physical activity intentions from counter- intentional habits such as binge-drinking •  H3: that mindfulness would moderate the effects of binge-drinking intentions and drinking habits on physical activity behavior such that habitual binge drinking and binge- drinking intentions would be negatively associated with physical activity behavior only among individuals who did not act mindfully and not among individuals who acted mindfully
  • 7. blog.emergitect.com Descriptive Statistics blog.emergitect.com
  • 8. blog.emergitect.com Montecarlo Model Based Simulation blog.emergitect.com
  • 9. blog.emergitect.com Explanatory Data Analysis Scripts blog.emergitect.com
  • 10. blog.emergitect.com H1: Scatterplots blog.emergitect.com
  • 11. blog.emergitect.com H2: Scatterplots blog.emergitect.com
  • 12. blog.emergitect.com H3: Scatterplots 2a blog.emergitect.com
  • 13. blog.emergitect.com H3: Scatterplots 2b blog.emergitect.com
  • 14. blog.emergitect.com Simple Slope Scripts
  • 15. blog.emergitect.com H1: Path Diagram
  • 16. blog.emergitect.com H1: Simple Slope … intention behavior relationship would be stronger among individuals who acted mindfully than among individuals who did not?
  • 17. blog.emergitect.comblog.emergitect.com
  • 18. blog.emergitect.com H2: Simple Slope … intention-behavior relationship would be stronger among non-habitual exerciser than among habitual exercisers? blog.emergitect.co
  • 19. blog.emergitect.comblog.emergitect.com
  • 20. blog.emergitect.com H3: Simple Slope 2a … mindfulness would moderate the effects of binge-drinking intentions such that binge- drinking intentions would be negatively associated with physical activity behavior only among individuals who did not act mindfully and not among individuals who acted mindfully?
  • 21. blog.emergitect.comblog.emergitect.com
  • 22. blog.emergitect.com H3: Simple Slope2b Work Hard, Play Hard? … mindfulness would moderate the effects of binge-drinking habits such that binge- drinking habits would be negatively associated with physical activity behavior only among individuals who did not act mindfully and not among individuals who acted mindfully? Original Article Simulated Result
  • 23. blog.emergitect.comblog.emergitect.com
  • 24. blog.emergitect.com Summary •  Tools used - EXCEL, Mplus & R •  Finding the trees for the forest difficult without Theory to guide you •  Article’s descriptive statistics enable simulations to reproduce, analyze and reinterpret results •  Plan for analysis approach in your experimental design (duh!) •  Please publish all your covariances •  Matrices are not always invertible
  • 25. blog.emergitect.com MODEL RE-SPECIFIED
  • 26. blog.emergitect.com Montecarlo Covariance Simulation blog.emergitect.com
  • 27. blog.emergitect.com Study 2 Model Re-specified blog.emergitect.com
  • 28. blog.emergitect.com Study 1 Re-specified #1 blog.emergitect.com
  • 29. blog.emergitect.com Study 2 Re-specified #1 blog.emergitect.com
  • 30. blog.emergitect.com Study 1 Re-specified #2 blog.emergitect.com
  • 31. blog.emergitect.com Study 2 Re-specified #2 blog.emergitect.com
  • 32. blog.emergitect.com APPENDIX
  • 33. blog.emergitect.com Simple Slope Plots N(0,1)
  • 34. blog.emergitect.com Simple Slope Plots N(0,1)
  • 35. blog.emergitect.com Simple Slope Plots N(0,1)