We are developing a new regression model. We now need to develop an analogous to add1 in stat package.
My problem is about update.formula, but I think I could solve this problem if I can get source code of add1.
So, can I get the source code of add1?


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Prof. Dr. Antonio José Sáez Castillo
Dpto. de Estadística e Investigación Operativa. Universidad de Jaén
Escuela Politécnica Superior de Linares. Dep. A-229
c/ Alfonso X El Sabio 28. 23700 LINARES (Jaén). ESPAÑA.
Teléfono +34 953/648578. Fax +34 953/648578
http://www4.ujaen.es/~ajsaez/
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