Table 2.
Type and Subtype | Description | Notation | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
A. INTERRUPTED TIME-SERIES QUASI-EXPERIMENTAL DESIGNS | |||||||||||||
#15 | Interrupted time series that uses switching replications and a control group | A1c | A2c | A3c | X | A4t | A5t | A6t | removeX | A7c | A8c | A9c | A10c |
B1c | B2c | B3c | B4c | B5c | B6c | X | B7t | B8t | B9t | B10t | |||
#14 | Interrupted time series with repeated treatment design13 | A1c | A2c | A3c | X | A4t | A5t | removeX | A6c | A7c | X | A8t | A9t |
#13 | Interrupted time series removing the treatment at a known time | A1c | A2c | A3c | A4c | X | A5t | A6t | A7t | A8t | removeX | A9c | A10c |
#12 | Interrupted time series with a nonequivalent dependent variable14 | (A1cv, A1cn) | (A2cv, A2cn) | (A3cv, A3cn) | X | (A4tv, A4tn) | (A5tv, A5tn) | ||||||
#11 | Interrupted time series with an untreated control group12 | A1c | A2c | A3c | A4c | A5c | X | A6t | A7t | A8t | A9t | A10t | |
B1c | B2c | B3c | B4c | B5c | B6c | B7c | B8c | B9c | B10c | ||||
#10 | Simple interrupted time series11, 15 | A1c | A2c | A3c | A4c | A5c | X | A6t | A7t | A8t | A9t | A10t | |
B. QUASI-EXPERIMENTAL DESIGNS THAT USE CONTROL GROUPS | |||||||||||||
# 9 | The control group design that uses dependent pretest and posttest samples and switching replications | A1c | X | A2t | removeX | A3c | |||||||
B1c | B2c | X | B3t | ||||||||||
# 8 | The untreated-control group design that uses dependent pretest and posttest samples and a double pretest | A1c | A2c | X | A3t | ||||||||
B1c | B2c | B3c | |||||||||||
# 7 | The untreated-control group design that uses dependent pretest and posttest samples | A1c | X | A2t | |||||||||
B1c | B2c | ||||||||||||
# 6 | The posttest-only design that uses an untreated control group | X | A1t | ||||||||||
B1c | |||||||||||||
C. QUASI-EXPERIMENTAL DESIGNS THAT DO NOT USE CONTROL GROUPS | |||||||||||||
# 5 | The repeated-treatment design | A1c | X | A2t | removeX | A3c | X | A4t | |||||
# 4 | The removed-treatment design | A1c | X | A2t | A3t | removeX | A4c | ||||||
# 3 | The 1-group pretest-posttest design that uses a nonequivalent dependent variable | (A1cv, A1cn) | X | (A2tv, A2tn) | |||||||||
# 2 | The 1-group pretest-posttest design that uses a double pretest | A1c | A2c | X | A3t | ||||||||
# 1 | The 1-group pretest-posttest design | A1c | X | A2t |
Note: Classification types adapted prior publications1, 2; A, B = Groups; 1,2,3, etc.= observations for a Group; X= intervention; removeX = remove intervention; v=variable of interest; n=non-equivalent dependent variable; t=treatment group; c=control group. Time moves from left to right. Citations are published examples from the literature.