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Strategies & Market Trends : A.I.M Users Group Bulletin Board -- Ignore unavailable to you. Want to Upgrade?

To: OldAIMGuy who wrote (4708)	5/13/1998 12:40:00 PM
From: Bruce A. Bowman	Respond to of 18928

Hi Tom- I should have known there wasn't any confusion. Sorry. re: Fosback's variation... that makes sense, of course, but I think the number of unchanged issues must enter into the equation somewhere. Not in the breadth, but maybe in developing the proportion. That would mean dividing by the sum of adv + dec + unch. The sublety is that the number of unchanged issues will include some that didn't trade (on a weekly basis, I don't know if that's significant). I know that the total issues listed is changing daily on Nasdaq, do you have any idea how big the daily or weekly fluctuation is? Your reference to comparing 1980 vs. 1998 suggests that it's probably LT accumulation of change that is the suspected source of the problem. AIQ software isn't the last word in how to compute indicators, but they do collect unchanged-issues data. So I just checked their reference manual to see how they use the unchanged-issue data. Surprise, surprise: they don't! So it looks like I've either got data I'm not using or they just don't tell me what they do with it. Bruce