how to calculate pivot points from annual data with Bry G. and Boschan C.

[N.N.]

Cristian, maybe this can help you.
You can try the following links

ideas.repec.org/c/boc/bocode/rts00031.html
ideas.repec.org/c/boc/bocode/s457288.html
ideas.repec.org/h/nbr/nberch/2148.html

or buy the book...

www.nber.org/books/bry_71-1

Hope this can help you.

Alain Vanhentenryck.
Belgium

-- 
Complex numbers: They are all fun and games until someone loses an i.