==Historic Crashes==
Data before the 1980s probably isn't useful. It was a different world back then, both in terms of globalization and in terms of how stock markets worked. So, I'll start with the 1987 crash and go forward from there. I'm going originally tried to suggest three classes of crash, like hurricanes:
{| class="wikitable"
! Class !! Description
*2011: 1 obs
*2020: 6 obs (and counting, including second and third largest)
I revamp this approach to find 12 crashes (14 including the current one and the 1929 Wall Street Crash) and the data naturally groups itself into 4 categories.
==Scripts and Analysis==