QSAR equations

Dear list,
 I'm working on a pseudoreceptor model, using the PrGen software.
 I'm writing to ask about QSAR equations, in particular, about the
 physical meaning of the slope value.
 It's well to obtain a good correlation with a big value of slope, or
 What is the optimal value?
  Forli Stefano
  Dip. Farmaco Chimico Tecnologico
  Universita' degli Studi di Siena
  Via Aldo Moro
  I-53100 Siena, Italy
  Phone: ++39 0577 234307
  Fax: ++39 0577 234333