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help > RE: Single subject pre/post treatment analysis
Jul 4, 2015 12:07 AM | Alfonso Nieto-Castanon - Boston University
RE: Single subject pre/post treatment analysis
Hi Kaitlin,
Yes, exactly. In the case where you have repeated measures pre/post for your controls as well, if you want to evaluate the pre vs. post differences in your control group you could select the subject-effects "patient" and "controls" (contrast [0 1]) and the conditions "pre" and "post" (contrast [-1 1] or [1 -1]). Last, if you want to evaluate the group by intervention interaction (i.e. compare the post-pre differences in your single patient vs the same differences observed in the control group) you would do that by selecting the subject effects "patient" and "controls" (contrast [1 -1]) and the conditions "pre" and "post" (contrast [-1 1]) and looking at the two-sided stats/results.
Hope this helps
Alfonso
Originally posted by Kaitlin Cassady:
Yes, exactly. In the case where you have repeated measures pre/post for your controls as well, if you want to evaluate the pre vs. post differences in your control group you could select the subject-effects "patient" and "controls" (contrast [0 1]) and the conditions "pre" and "post" (contrast [-1 1] or [1 -1]). Last, if you want to evaluate the group by intervention interaction (i.e. compare the post-pre differences in your single patient vs the same differences observed in the control group) you would do that by selecting the subject effects "patient" and "controls" (contrast [1 -1]) and the conditions "pre" and "post" (contrast [-1 1]) and looking at the two-sided stats/results.
Hope this helps
Alfonso
Originally posted by Kaitlin Cassady:
Hi Alfonso,
Thanks! This is very helpful. For the second-level analyses in the situation of repeated measures for both patients and controls (2 sessions each), if I wanted to evaluate the pre vs. post differences with controls at zero, I assume that the "Between-subjects contrast" would be [1 0], and the "Between-conditions contrast" would be [-1 1] or [1 -1]. Is that correct?
Thanks!
Kaitlin
Thanks! This is very helpful. For the second-level analyses in the situation of repeated measures for both patients and controls (2 sessions each), if I wanted to evaluate the pre vs. post differences with controls at zero, I assume that the "Between-subjects contrast" would be [1 0], and the "Between-conditions contrast" would be [-1 1] or [1 -1]. Is that correct?
Thanks!
Kaitlin
Threaded View
| Title | Author | Date |
|---|---|---|
| Helen Carlson | Jun 5, 2014 | |
| Alfonso Nieto-Castanon | Jun 7, 2014 | |
| Batiah Keissar | Nov 19, 2022 | |
| Kaitlin Cassady | Jun 26, 2015 | |
| Alfonso Nieto-Castanon | Jun 29, 2015 | |
| Nabila BRIHMAT | Nov 21, 2020 | |
| Nabila BRIHMAT | Nov 30, 2020 | |
| Johann Philipp Zöllner | Jan 24, 2016 | |
| Alfonso Nieto-Castanon | Jan 25, 2016 | |
| Kaitlin Cassady | Jun 30, 2015 | |
| Alfonso Nieto-Castanon | Jul 1, 2015 | |
| Kaitlin Cassady | Jul 2, 2015 | |
| Alfonso Nieto-Castanon | Jul 4, 2015 | |
| Kaitlin Cassady | Jul 6, 2015 | |