In the comments for an older post, a reader named Michael asked:
"Did you start your porfolio on July 13th as I can see on your chart? Do
you use the big picture to manage your cash level in your porfolio: the "M" in
CANSLIM? Do you think it could be a good idea to sell everything when the market
is in a down trend? Waiting for your comments!"
I started both the index and the portfolio on July 13th. I must apologize about the portfolio. I haven't updated it this week. A bit of background. I calculate the index myself. I use fidelity data feed for price history and the weekly downloaded excel spreadsheet of the ibd 100 for composition. I wrote a computer program to import the data, re-balance the weightings, and update the index values. When you see the graphs of the index generated by Wealth-lab, it is Wealth-lab using a text file with my calculated index values as a data source.
For the portfolio, I was manually entering the trades into the Wealth-lab portfolio manager. But last week, I realized that Wealth-lab was not calculating the available cash correctly after I "sold" shares from the portfolio (remember, this is just a paper portfolio). This meant that my portfolio weightings were off.
So, when I get some free time next week, I'll write a program to re-construct the portfolio. I'll deduct commission as well. Remember, the weightings for the portfolio are not the same as the weightings for the index. The index is equal weighted, allows for fractional shares, and is re-balanced for equal weighting each week. The portfolio should begin $1000 dollars alloted to each component, but only whole numbers of shares can be purchased. Rather than re-balancing every week, I will sell the shares which are dropped, and use the cash proceeds to purchase the newly added components in equal dollar allotments.
I began tracking the IBD 100 on July 13th, but we have to remember that the new IBD 100 list is published after the close on Friday. So the first close of the Index is Monday, July 16th.
I read The Big Picture every day, but I am not using it in either the index or the portfolio. I guess I wanted to test the claim that the IBD 100 "trounces" the S&P 500. I can't remember where I first read this, but if you google it, you'll find this quote frequently.
I was intrigued in part because it's an odd claim to make. Until I came along, the IBD 100 was not an index. It was just a list of stocks which changed weekly. The S&P 500 attempts to be representative of the broad market, while the IBD 100 is representative of high relative strength stocks, ranked by a proprietary algorithm.
If you look at the IBD 100 components, it is certainly astounding how many high percentage gainers there week after week. But this sort of at a glance analysis is strongly skewed by survivorship bias. The worst performing stocks in the list are dropped weekly.
So the index was created to try to compare the IBD 100 list to the S&P in a reasonable manner. While I was at it, I decided I wanted to see if trading the IBD 100 list in a very naive way might actually be profitable. To be clear, IBD and William O'Neil's books all say not to do what I'm doing with the portfolio.
In fact...I'm not doing it with real money. It's a paper portfolio.
But I wanted to see what would happen anyway. In part it comes from the sense of frustration that the best performing stocks in the IBD 100 are often (and by definition) the most extended. Mark Fisher, used to say that "the best trades are the hardest to take". We see this all the time with the IBD 100. The best performers don't give you a many chances to get in, or when they do, you feel like you're catching a falling knife.
Anyway...that's what I was thinking about with the portfolio.