[R] All subsets regression

counts(resp=Scars~.,x=~Location + Lar + Mass + Lac + Lar:Mass + > Location:Mass, data = alan2, distr="ZIP") Many thanks Alan Harrison Quercus Queen's University Belfast MBC, 97 Lisburn Road Belfast BT9 7BL T: 02890 972219 M: 07798615682

[R] Optimization problem

alue supplied by optim In addition: Warning message: fitted probabilities numerically 0 or 1 occurred in: glm.fit(zz, 1 - pmin(y, 1), family = binomial()) I understand this is a problem with the model I specified, could anyone help out?? Many thanks Alan Harrison Quercus Queen's University

[R] Newbie

zinb.zc<- zicounts(resp=Scars~.,x=~Age,z=~Age, data=alan) Error in solve.default(z0$hessian) : system is computationally singular: reciprocal condition number = 3.44599e-18 Cheers Alan Alan Harrison Quercus Queen's University Belfast MBC, 97 Lisburn Road Belfast BT9 7BL