The method in this document suggest putting two outcome values at one time point. Can you do that?
See pages 48 to 51 of this link. Let me know if you think this method is valid or not. Thanks
http://www.oregoneval.org/ANALYSIS%20OF%20INTERRUPTED%20TIME%20SERIES%20FINAL.pdf
Hi,
Consider using DID method rather then time series analysis as the time factor in your question seems to be 'before' and 'after'
you can start with this article:
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