Abbreviated Interrupted Time-Series - Institute for Policy Research
Abbreviated Interrupted Time-Series - Institute for Policy Research
Abbreviated Interrupted Time-Series - Institute for Policy Research
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<strong>Abbreviated</strong> <strong>Interrupted</strong> <strong>Time</strong> <strong>Series</strong><br />
• We use abbreviated ITS loosely<br />
– series with only 6 to 50 time points<br />
• Pretest time points are important<br />
– valuable <strong>for</strong> estimating pre‐intervention growth<br />
(maturation)<br />
– control <strong>for</strong> selection differences if there is a<br />
comparison time series<br />
• Posttest <strong>for</strong> identifying nature of the<br />
response, especially its temporal persistence