By looking at the dates these spikes occur and then checking online I have flagged four historical "Black swan" events that occured within the time frame the data covers, which are listed in chronological order below:
- Precious metals price collapse in mid April 2013
- Swiss Franc coming off its peg to the Euro in January 2015
- Fears over the Hong Kong dollar and Renminbi currency peg in January 2016
- Brexit black Friday
test set to stress test any finished model. More in due course.