Manipulate mediator | Causal inference


Methods to manipulate the mediator in a controlled experiment

  • Direct manipulation: The researcher can directly manipulate the mediator by providing participants with information or instructions that are designed to change their level of the mediator. For example, a researcher might provide participants with information about the benefits of exercise in order to increase their motivation to exercise.
  • Indirect manipulation: The researcher can indirectly manipulate the mediator by manipulating a variable that is known to be related to the mediator. For example, a researcher might increase participants' self-efficacy by providing them with training on a task, and then measure the effect of this training on their motivation to perform the task.
  • Naturalistic manipulation: The researcher can manipulate the mediator in a naturalistic setting by creating an environment that is conducive to change in the mediator. For example, a researcher might create a group setting where participants are encouraged to discuss their goals and to provide each other with support, in order to increase their motivation to achieve their goals.
  • It is important to note that the effectiveness of any particular manipulation will depend on the specific mediator that is being targeted. For example, a direct manipulation of motivation may be more effective than an indirect manipulation of self-efficacy for increasing exercise behavior.

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