Design Notation Flashcards
(11 cards)
1
Q
X
A
experimental Intervention or levels of the IV
If more than 1 level of intervention is applied subscripts are attached (X1,X2)
Multiple Factors XA, XB, XC
2
Q
O
A
Observation or measurement of the DV
Subscripts for observations identify the orders of measurements (O1,O2))
3
Q
R-
A
randomly assigned groups
4
Q
1-group pretest-posttest
A
O1 X O2
- Quasi experimental
- One set of measurements taken before and after treatment on one group of subjects
- Effect of treatment is determined by comparing pretest and posttest scores
- Ex. “Effect of TENS on shoulder pain in persons with hemiplegia-
- Non controlled, non randomized
5
Q
Pretest-posttest control Group design
A
- Compares 2 or more groups formed using random assignment
- Groups tested prior to and following treatment
- Strong in internal validity due to pretest scores establishing group equivalence
- Can be configured in many ways
6
Q
2-GROUP PRETEST-POSTTEST DESIGN
A
- 2 experimental groups
- Compare “New tx” to “old tx”
- Pretests establish initial equivalence
- Group 1 acts as a control for group 2
7
Q
Non equivalent pretest posttest control group design
A
- Used with intact groups or with self selection
- No randomization possible quasi- experimental
8
Q
Non equivalent control group design with multiple pretests
A
multiple pretest measures insures group equivalence over time (“run-up”)
9
Q
Posttest only group design
A
- Used when a pretest is impractical or potentially reactive
- Attitudinal surveys- ‘ “How did you feel after…”
10
Q
Non equivalent Posttest only Control group designs AKA (static group comparison)
A
- Compares existing groups who have and have not received treatment
- Ex. patients who have worn a leg brace to those who have not over a 6MWT
- Internal validity weak due to selection bias and attrition
11
Q
One group interrupted time-series design
A
- IV is time
- Intervals should be evenly spaced
- Multiple pretests and Posttests are a type of control
- Demonstrates maturational effects or confounders
