[system-traders] Advancing/Declining ratio

[Michael Thon <mike012012 AT yahoo.com>]

Its good to see some traffic on this mailing list.  I downloaded GT  
some time ago but never looked at it seriously but recently I started  
to work on it again and now I'm making progress on understanding how  
to write system aliases etc.

I'm wondering how to write an indicator that can return the A/D ratio:  
the ratio of the number of advancing stocks to the number of declining  
stocks.  I also would like to experiment with the ratio of stocks  
making new 52 day highs vs new 52 day lows.  Basically, these are  
indicators that look at a whole range of stocks rather than a single  
one.  I think I'd have to write a new perl module for this.  I don't  
see how it could be done using an alias.

Cheers
Mike