SINGLE CASE METHODOLOGY - PowerPoint PPT Presentation

1 / 24
About This Presentation
Title:

SINGLE CASE METHODOLOGY

Description:

SINGLE CASE METHODOLOGY. Steven G. Little & Angeleque Akin-Little. Walden University, USA ... Types of single case designs. Data Evaluation Visual Inspection ... – PowerPoint PPT presentation

Number of Views:67
Avg rating:3.0/5.0
Slides: 25
Provided by: stevenl152
Category:

less

Transcript and Presenter's Notes

Title: SINGLE CASE METHODOLOGY


1
SINGLE CASE METHODOLOGY
  • Steven G. Little
  • Angeleque Akin-Little
  • Walden University, USA

2
Overview
  • Nature of single case methodology
  • General features of single case design
  • Types of single case designs
  • Data Evaluation Visual Inspection
  • Data Evaluation Statistical Evaluation
  • Cautions and Considerations

3
Definition
  • Quasi-experimental research designs involve
    assessing change in a dependent variable on a
    single subject or a small group of subjects.
  • Alternative to group designs
  • It is NOT a case study. It has much more control
    and rigor than a case study.

4
Also called
  • Single-Subject Designs
  • Single-Participant Designs
  • Intrasubject-Replication Designs
  • N1 Research
  • Intensive Designs
  • Repeated Measures Designs
  • Clinical Research Model
  • Time Series Design

5
General Features
  • Continuous Assessment - Repeated observations of
    performance over time
  • Baseline Assessment - Observing behavior for
    several observation periods before the
    intervention is implemented. Called the A phase.
    Treatment is B phase. The more stable
    performance is during baseline, the better our
    prediction of what future behavior will be like.

6
Stable Baseline
  • Baseline Projected future performance
  • ? ? ? ? ?
  • ______________________________________________
  • 1 2 3 4 5
  • Days

7
Increasing Baseline
  • Baseline Projected future performance
  • ?
  • ?
  • ? ?
  • ?
  • ________________________________________
  • 1 2 3 4 5
  • Days

8
Decreasing Baseline
  • Baseline Projected future performance
  • ?
  • ?
  • ? ?
  • ?
  • ________________________________________
  • 1 2 3 4 5
  • Days

9
Variable Baseline
  • Baseline Projected future performance
  • ?
  • ? ? ?
  • ?
  • ____________________________________________
  • 1 2 3 4 5
  • Days

10
AB Design
  • A B
  • ? ? ? ? ? ? ?
  • ? ?

  • ? ?
  • ?
    ? ?
  • ?
  • _________________________________________
  • 1 2 3 4 5 6 7 8 9 10 11 12
    13 14 15
  • Days

11
ABAB Design
  • A B A B
  • ? ? ? ? ? ?
    ? ?
  • ?
    ? ?
  • ?
    ?
  • ? ?
    ?
  • ?
    ? ? ?
  • 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
    16 17 18 19 20
  • Days

12
Problem With ABAB
  • A B A B
  • ? ? ? ? ? ?
  • ?
  • ?
  • ?
  • ?
    ? ? ? ? ? ? ? ? ? ?
  • 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
    16 17 18 19 20
  • Days

13
Multiple Baseline
A
B

P1
P2
P2
14
Data Evaluation Visual Inspection
  • Visual Inspection
  • Therapeutic Criterion
  • Pattern of Data
  • Obvious Effects
  • Changes in Magnitude
  • Changes in Trend
  • Changes in Latency
  • Nonoverlapping Data Points

15
Changes in Means
16
Changes in Level
17
Changes in Trend
18
Changes in Latency
19
NonOverlapping Data Points
20
Data Evaluation Statistics
  • t and F Tests
  • Time-Series Analysis
  • Other Tests

21
Cautions Considerations
  • Blocking Data

22
Types of Graphs
23
Duration of Phases
  • Not specified in advance.
  • Collect data and examine it to determine whether
    the data are clear to make predictions.
  • If you have trends or variability in the data
    then you may need to extend the phases.
  • 3 to 5 days is probably a safe bet for a minimum.

24
Contact Information
  • Steven G. Little, Ph.D
  • Angeleque Akin-Little, Ph.D.
  • 152 Shady Acres Rd.
  • Tupelo, MS 38804 USA
  • 1-662-841-0008
  • slittle2_at_waldenu.edu
  • aakinlit_at_waldenu.edu
Write a Comment
User Comments (0)
About PowerShow.com