Security

Period

n

λν

γ (λν)2

(1 − λ)ν

S&P 500

2018

251

0.0122

γ 0.01222

0.0003

S&P 500

2019

252

0.0154

γ 0.01542

0.0005

S&P 500

COVID-19

Pandemic

63

0.0317

γ 0.03172

0.0021