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October 29, 2018 at 1:20 am #101861Nick RadgeKeymaster
Unlikely events happen (Black Swans). Here’s a few that occurred this month…
– SPX fell 10% in February this year. It’s down 10% since its all-time high (ATH) in September. Two falls of 10% from an ATH in one year has only happened once since 1960.
– When SPX has been in an uptrend (defined as above the 12-month ma), SPX has fallen more than 9% in one month two times in one year only 3 other times: in 1980, 1990 and 2000
– Daily volatility is in some respects the most extreme in one month since 1963.
– Stocks have fallen 15 days in October, the highest proportion since 1970
– the SPX has not risen on two consecutive days in more than 5 weeks; since the 1930s, this has happened less than 10 times, and in the last 30 years it has happened only 3 times
– The rapid fall has pushed weekly momentum (RSI) over the past 5 weeks to under 14. In the past 40 years, this has only happened during bear markets: 1981, 1987, 1990, 2001-02 and 2008. None of these happened within 5 weeks of an all-time high, which is the case this time.
– this month is the worst mid-term October since 1978 and the second worst since 1930
October 29, 2018 at 9:51 pm #109322TimothyStricklandMemberThanks Nick. I was looking at the charts today after the close and was perplexed how the market fell so much so fast. I haven’t been trading that long so for me it is the worst I have ever experienced. I plan on taking my strategies to the sim next month and all of them will be starting in cash.
This is a good data point though, it means this things can still occur.
October 29, 2018 at 10:03 pm #109326TimothyStricklandMemberNick, you mentioned updating your system every year, currently this month the drawdown on my new systems are out of tolerance, in this case would you recommend go back and take a second look at them, after this month is over? Or leave it alone?
October 30, 2018 at 2:38 am #109328Nick RadgeKeymasterQuote:currently this month the drawdown on my new systems are out of toleranceThat’s why I have posted the above comments. It was a Black Swan event, the likes of which haven’t been seen during your test period.
I will not be changing my parameters. I have a set date each year that I adjust, and until that date I’ll keep plodding along.
October 30, 2018 at 2:58 am #109330TimothyStricklandMemberThanks Nick,
Just trying not to assume anything anymore, especially when I can just ask and possibly save myself some time figure things out the hard way.
I was curious and never did this before but attempted to run a few simulations without an index filter and the results were disastrous.My NDX Aggressive system actually ran out of money. The NDX Momo took 2 years to come out of drawdown and were was 12% lower CAGR but 20% more MAXDD. That is just ugly.
At the very least this reinforces even more that all the testing I have done is to be relied heavily upon and not my own gut feelings. Rather than assume, just test the theory and see how it performs.
I am slowly trusting the process more and more each day.
October 30, 2018 at 9:07 pm #109331Nick RadgeKeymasterAnd…
Today will mark the 28th consecutive day the S&P 500 doesn’t have back-to-back up days.
Tying the longest streak since the Great Depression.
October 31, 2018 at 3:59 am #109323RobGilesMemberThis “black swan” event has highlighted to me how important start date dependency is when testing / assessing trend following / momentum systems. If you’d piled into the market with your new MOM system at the recent highs, I would imagine that its going to take a while to recoup those losses.
November 1, 2018 at 2:01 am #109342TimothyStricklandMemberGood point Rob. Luckily I started back in July so I accumulated a bit of profits before this mess occurred, it still hurts though.
November 1, 2018 at 4:45 am #109347Nick RadgeKeymasterQuote:If you’d piled into the market with your new MOM system at the recent highs, I would imagine that its going to take a while to recoup those lossesYou can go back and test how the long term CAGR changes depending on start date. The simple way is just pick major highs and use those.
The other way is rolling window analysis as per Unholy Grails.
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