To: s berg who wrote (2122 ) 3/15/1999 11:10:00 AM From: Q. Read Replies (1) | Respond to of 2506
s berg, that was a very interesting post about your backtesting of the low RS/ neg cashflow. I was unfamiliar with q investor, so I went to their site to look. They get their data from MarketGuide, who also supplies data to Telescan, which is what I have been using. So it isn't too surprising that you can reproduce the same screen. It looks like q investor allows you to do much more than Telescan, like construct your own ratios etc. as screening variables. That might allow one to build a better screen than the one that I did, for the purpose of identifying companies with liquidity problems. Thanks again for your backtesting. Backtesting in q investorlooks like a truly wonderful feature. Telescan gives me a backtest of 1-12 months, which is a lot better than nothing, but nothing like q investor, which goes back to 1985. Can you tell me how the backtesting worked in the case of your test of the low/RS neg cashflow? Did you pick your stocks once on Jan first each year beginning in 1985, or more often than that? Did you assume holding the short position for 12 mos? regarding the variables in the screen, the price/book and price/sales ratios are used only to eliminate value stocks. As you mention, setting a low threshold for these criteria reduces the number of stocks that otherwise would qualify for the screen. What I did approximately a year ago is I took the screen, using Telescan's 12 mo backtesting, and I played with each variable individually until I got optimized results for 1-12 months. price/sales and price/book were not the most important criteria, but they are helpful. If you are backtesting over a different period, I'm sure that you would find different optimum values for all the parameters, compared to what I found. It might be worth trying. If q investor allows you to screen on 'cash flow from operations' or some other cash flow, rather than free cash flow, that might be worth trying. 'Free cash flow' is the only cashflow offered by Telescan, so that's why I used it. In fact, Telescan, being true to their sloppy style, doesn't even bother to tell me exactly how 'free cash flow' is defined. I'll give some thought to q investor. The cost of the 12 mo. package is more than 2X what I'm paying for Telescan is the only thing that bugs me.