[R--gR] Modelformulae: reference?

Friedrich.Leisch at tuwien.ac.at writes:

On Fri, 20 Aug 2004 08:12:34 +0100,
Steffen Lauritzen (SL) wrote:

  > Yes, I am sure this is right, thank you.

You're welcome.

  > It has no doubt developed a bit
  > since then, possibly in a partly anarchistic way.

Yes, certainly. For S, the white book is the key reference.

...although much of the "anarchy" is probably of a later date. AFAIR,
the white book model formulas basically copies Genstat notation from
1977 for the lm/glm models (introducing the ~ operator and changing
"." to ":" is about the extent of it, I think), which in turn more or
less *is* Wilkinson/Rogers. Usage in other contexts and things like
the "|" for conditioning in coplot or strata() terms came in later. 

Of course the department copy of the white book is nowhere to be found
so I can't verify.

O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907