quasi-experimental research design
5
Quasi-experimental design • When individuals are not random assigned, the experimental design is known as a quasi- experimental design WHAT WHEN It’s not possible for investigators to undertake true experiments, e.g. in random assignation of participants to control or experimental groups
-
Upload
vohuynhthanh -
Category
Education
-
view
373 -
download
0
Transcript of quasi-experimental research design
Quasi-experimental design
• When individuals are not random assigned, the experimental design is known as a quasi-experimental design
WHAT
WHENIt’s not possible for investigators to undertake true experiments, e.g. in random assignation of participants to control or experimental groups
Quasi-experiment design
o Non-equivalent (Pretest and Post-test) Control-Group Design
o Single-Group Interrupted Time-Series Designo Control-Group Interrupted Time-Series Design
Variations (HOW)
Quasi-experiment design
In this design, the experimental Group A and the control Group B are selected with random assignment. Both groups take a pre-test and post-test. But only the experimental group receives the treatment.
Group A O------- X ------O
Group B O----------------O
Variations
Non-equivalent (Pretest and Post-test) Control-Group Design
Quasi-experimental design
In this design, the researcher records measure for a single group both before and after a treatment.
Group A O------O------O------O------- X ------O-----O-----O------O
Variations
Single-Group Interrupted Time-Series Design
Quasi-experiment design
This is a modification of Single-Group Interrupted Time-Series Design in which two groups of participants, not randomly assigned, are observed over time. A treatment is administered to one of the group (i.e. group A)
Group A O------O------O------O------- X ------O-----O-----O------O
Group B O------O------O------O------- O------O-----O-----O------O
Variations
Control-Group Interrupted Time-Series Design
