Greenblatt's Little Book That Beats The Market Message Board

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Strategies & Market Trends : Greenblatt's Little Book That Beats The Market

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To: Jurgis Bekepuris who wrote (190)	3/2/2013 12:39:01 AM
From: Shane M	Read Replies (1) of 218

I guess if you like custom data it's more difficult to automate. I do have the database pre-calculate certain specific fields that I want if it's non-standard but derivable from existing data - but if I can't do it within the database I don't do it because ongoing manual maintenance just isn't what I can keep up for that many stocks. Anything beyond that gets done in excel based on what is export. But yes - I'd agree that if you like your own data and can't derive your own data from existing fields in standard databases, then automation of some steps is probably not a way to go. Keeping track of that type of data in dynamic time series is difficult doing things manually. Based on the adjustments that you say you do, there's clearly a limitation to how much work you could have the computer do for you. I agree with what you say though - the value in the automation is not the initial screening process - it's the assistance in routine flagging of things that are "interesting" after the initial screens to draw attention for closer look. if interested - fwiw, to give an idea framework of how the update process I use works - I just looked at my Buffettology spreadsheet and in it I export 107 columns of data for each stock from the database. From there I have about 116 columns of further calcs that help with the automated projections. For manual stuff on the interesting companies I copy the row of data for a particular stock into a separate worksheet where I have a more tweakable/changeable template where certain factors in the future projection are manually tweakable - but I don't save tweaks each time. The Greenblatt spreadsheet was developed much later than the Buffettology approach, but it's based on a similar process - exporting 110 columns for each company and then have another 100 columns of calcs and a few macros to manage the final sorting for me once all the weighting/ranking of various measures is done. It's not very complicated, I think it's just mostly weighting a bunch of different factors that go into the ultimate ranking. (Like I mentioned, the Greenblatt approach I use is modified to include more than ROC and yield. I did this after realizing I still wanted to look at the Greenblatt companies based on factors I valued, and I tried to bubble those with desirable factors closer to the top of the list based on adjustments). And I guess as a last thing I use is something I recently built that I find find very useful: I'm visual, so I have a separate spreadsheet with charts of alot of long term trends on specific factors that I like to look at, but it's a separate deal that I use to just pull up things that are "interesting" so I can quickly glance at what's happened up to this point. anyhow, good luck with it - but I guess to circle back to your initial concerns - I agree with your concern that the more custom adjustments you do to find your interesting companies - the less valuable the automation will likely be to you, and it may not save you that much time in that context.

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