Out of curiosity: How do you test your sheets? I feel like I can arrive at such a sheet over a few days of reading, but unsure how I'd test I'm doing the right things (since there isn't a tool or a combination of tools that can act as oracle)
As you can imagine - when there is a severe market drop, most investments are highly correlated to the S&P. The most negative correlation I could get was medium term bond ETFs. Short term bonds were still highly correlated and I am not sure why.
The dot com bust was particularly interesting because each segment dropped at different times. Telecom dropped first, then tech. It took about a year for the drop to hit mid cap. In comparison - the 2008 crash hit everything quickly.
Also - lately I have been using the backtesting tools in TOS. As I said earlier, this only works for stocks and not ETFs.
=query(importhtml(concatenate("https://ycharts.com/companies/",$A4,"/dividend"),"table",0),...)
where $J$2 is ="select Col6 where Col1 > date '"&TEXT(I2,"yyyy-mm-dd")&"' LIMIT 12"