research design in clinical psychology l.
Download
Skip this Video
Download Presentation
Research Design in Clinical Psychology

Loading in 2 Seconds...

play fullscreen
1 / 7

Research Design in Clinical Psychology - PowerPoint PPT Presentation


  • 339 Views
  • Uploaded on

Research Design in Clinical Psychology. Lecture 5 Control Groups (Chapter 7 in Kazdin). Control Groups 1. No treatment control groups Helps rule out confounds such as hx or maturation, and spontaneous remission

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Research Design in Clinical Psychology' - aulii


Download Now An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
research design in clinical psychology

Research Design in Clinical Psychology

Lecture 5

Control Groups

(Chapter 7 in Kazdin)

control groups 1
Control Groups 1
  • No treatment control groups
      • Helps rule out confounds such as hx or maturation, and spontaneous remission
      • Can’t use drop-outs, as they are self-selected as opposed to randomly selected to this group
  • Wait-list control group
      • Tx given after tx period is over for group 1
        • Must only use participants who in advance agree to remain in if placed in this group, otherwise, could introduce serious confounds
      • Three key features
        • No tx between pretest and end of waiting period
        • Waiting period must = tx period of other group
        • Waitlist group completes 2 rounds of preassessment & one of post
control groups 2
Control Groups 2
  • No contact control
      • They don’t even realize they are in the study
  • Nonspecific-treatment or “Attention-Placebo” control
      • Nonspecific factors are controlled, so the specific mechanisms of change can be somewhat isolated and evaluated
        • Control for common factors
        • Credibility is key
        • Could produce problems as well
          • Reduce faith in therapy or leads individuals to never seek real tx
  • Routine/Standard Treatment
      • All receive an acceptable tx
      • Limited attrition
      • Controls for nonspecific factors etc across intervention and control
      • More likely to have therapist compliance
control groups 3
Control Groups 3
  • Yoked Control
      • Subjects are matched to each other
      • Issues of construct validity should drive this decision
  • Nonrandomly assigned or nonequivalent control group
      • Patched up control group
      • formation of addition group for comparison w/o random assignment
      • Has limitations
  • Larger issues
      • In what cases are control groups unnecessary?
evaluating psychotherapy research 1
Evaluating Psychotherapy Research 1
  • Treatment Package
    • Does tx produce therapeutic change
      • Evaluate treatment as normally used
      • Treatment vs. no treatment or wait-list control
  • Dismantling Strategy
    • What components of a known tx are central to mechanism of change and necessary
      • Groups that differ on components received
      • Can be used to isolate one of more component
  • Constructive-treatment Strategy
    • Opposite of dismantling (kind of)
evaluating psychotherapy research 2
Evaluating Psychotherapy Research 2
  • Parametric Study
    • What specific changes can be made to improve treatment
      • Focus on dimensions (e.g., duration)
  • Comaprative-treatment Strategy
    • Which tx is more effective for a given problem
      • Can vary along several dimensions
evaluating psychotherapy research 27
Evaluating Psychotherapy Research 2
  • Treatment-Moderator Strategy
    • What characteristics are necessary for effectiveness
      • Gender, ethnicity etc
      • WHAT HAS AN EFFECT
  • Treatment-Mediator Strategy
    • Used to identify mechanisms of change in tx
      • W/n treatment – no comparison group
      • WHY IT HAS AN EFFECT
ad