1 / 7

Multiple-Baseline Designs

Multiple-Baseline Designs. Description: Intervention evaluated by examining Bx across different baselines Intervention is introduced to different baselines at different points in time Functional relationship: Bx changes only when intervention is applied. Multiple-Baseline Designs (Cont.) .

benjamin
Télécharger la présentation

Multiple-Baseline Designs

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Multiple-Baseline Designs • Description: Intervention evaluated by examining Bx across different baselines • Intervention is introduced to different baselines at different points in time • Functional relationship: Bx changes only when intervention is applied

  2. Multiple-Baseline Designs (Cont.) • Three types of MBL designs • MBL across subjects • BL and Tx phase for same target Bx of 2 or more subjects • MBL across behaviors • BL and Tx phase for 2 or more behaviors of the same subject • MBL across settings • BL and Tx phase for 2 or more settings in which the same Bx of the same subject is measured

  3. Multiple-Baseline Designs (Cont.) • MBL designs used when: • Interested in the same target Bx exhibited by multiple subjects • You have targeted more than one Bx of the same subject • You are measuring a subject’s Bx across 2 or more settings • MBL designs useful when: • Cannot use an ABAB design

  4. Multiple-Baseline Designs (Cont.) • MBL across subjects • Tx is staggered over time • Experimental control demonstrated when Bx changes for each subject only after Tx is implemented • MBL across behaviors • Tx is staggered across Bxs • Experimental control demonstrated when Bx changes only after Tx has been implemented for that Bx

  5. Multiple-Baseline Designs (Cont.) • MBL across settings • Same Bx, same subject, but Tx is staggered across settings • Experimental control demonstrated when Bx changes only after Tx is implemented in each setting

  6. Design Variations • Number of Baselines • Minimum of 2 baselines • Number of baselines contribute to strength of demonstration • Better to include several baselines in case one of the baselines does not change • Partial Applications of Treatment • If Tx has no affect on first BL, may not apply this Tx to other baselines • One BL may never receive Tx

  7. Problems & Limitations • Interdependence of Baselines • Change in one of the baselines carries over to another BL even though the intervention has not been applied • Inconsistent Effects of the Intervention • Some Bxs are altered when the intervention is introduced and others are not • Prolonged Baselines • Withholding Tx may be unethical • Prolonged baselines may result in performance improving before Tx has been applied • Undesirable Bxs may emerge

More Related