I just want to offer everyone a professional piece of advice. Large down moves in equity markets is exactly when you should buy equities because that's when expected returns are at their highest.
For example, say I have $1000 to invest every month. I'll take that $1000 and put $500 into an index fund and $500 into a savings account. Then, once the market dips 10% from its previous high, all the accumulated money in the savings accounts is invested over 4 weeks.
I made a simple google doc to back-test the strategy 5 years on the DJIA. It's very rudimentary, but I'd love to see if anyone tries a different approach.
https://docs.google.com/spreadsheets/d/18-2rBonJPPlg8n6YkpAj...