dockinGA wrote: ↑Sun Oct 02, 2022 7:37 pm
yankees60 wrote: ↑Sun Oct 02, 2022 6:13 pm
dockinGA wrote: ↑Thu Sep 29, 2022 10:52 am
I've done some math quite a while ago, using reasonable expected returns and volatility for the PP, and did a Monte Carlo simulation, and found a swr for longer retirements in the 50-60 year range to be more like 3.3% instead of 4%, with 90% confidence if I remember correctly.
From this post and subsequent posts in this topic you seem to be a great believer in the concept of Monte Carlo simulations? If so, how do you react to these Monte Carlo flaws that I just read in a book that I am reading?
Capture1.JPGCapture2.JPGCapture3.JPGCapture4.JPGCapture5.JPGCapture6.JPG
I'm aware of some of the limitations, but I consider MC simulations to be at least as useful as using the very small dataset we have available to us, meaning the small sample size of historical 'rolling' returns, especially for something like the PP that has even less rolling returns available due to gold's history. As with all tools, one must be aware of their limitations and then use them appropriately. Used incorrectly, they may be worse than worthless.
I'm curious on which book this information came from. I realize I'm reading much of this out of context, but it seems to be pinpointing flaws in MC simulations as it pertains to pure market timing or short term market predictions or something along those lines. Trying to use MC simulations to predict short term movements of the market is a fool's errand, no doubt. Trying to predict a large range of hypothetical outcomes for a portfolio over 50-60 years, and basically ignoring outliers and focusing on 90th percentile type results, is much less of a fool's errand. Trying to determine investment returns over the next 50-60 years and basing it off a small sample of 30 year rolling returns from a single country is also something of a fool's errand.
It starts with this web site:
http://retirementoptimizer.com/
"What is Aftcasting?
Luck is the second-most important factor for retirement planning; second only to withdrawal rate. Good luck can give you lifelong income, bad luck can deplete your portfolio very fast. It creates the perils of the sequence of returns and the sequence of inflation.
How can you visualize luck? This is where aftcasting comes in.
Aftcasting uses the actual market history, including growth rate and inflation, as they exactly happened in history. It reflects the actual sequence of events, the actual sequence of returns (stocks, interest rates, and inflation), AND the actual correlation between stocks, interest rates, and inflation, actual volatility, and actual black swan events exactly as they occurred since 1900. Now, you can see the worst-case situations and see what can go wrong, instead of assuming average growth rates or inflation. Unlike simulators, it shows not only the impact of random but also fractal events of the past.
To help you with your planning, I have three tools for you: 1. My aftcast retirement calculator (ORC), 2. My book, "Unveiling the Retirement Myth", 3. My course "Advanced Retirement Income Planning "
The book: Advanced Retirement Income Planning
The book is only 104 pages, cost $4.99, and someone like you could get through it quite quickly.
One of his major points is that you cannot ignore those 10% outliers because they carry so much weight, both good and bad.