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Following the schools closing, a week later there is a sustained increase in the IPDV for 2-3 weeks for www.portalongop.co.ao and www-05.nexus.ao.
To attempt to get a better signature for such a sustained increase we took two adjacent windows of 14 days, averaged the data in each window, and slide the windows forward in time we can look at the average (avg), standard deviation (std for each window and compare their difference as a function of the date of the start of the more recent window. Doing this for www.portalangop/co.ao we get the chart below:
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