[Gretl-users] internal variables

Hi, I would like to ask a question on internal variables in gretl. From the command reference I have learned that one can access the fitted values from the mast regression command using an internal variable called $yhat. So, after running a probit regression one can obtain the predicted probabilities via $yhat. I would like to know if there is a variable that stores the values of the linear predictor. Formally, in addition to obtaining F(xb), I would also like to obtain xb, for non-linear models such as probit, logit or poisson. In probit regression, the linear predictor will e.g. be useful for computing Mills' ratio or slopes (other than those computed by gretl). I have another slightly related question. Under the genr entry, the gretl command reference tells that one can access estimated coefficients using coeff(var). I tried the following using one of Wooldridge's sample datasets: open jtrain2 ols re78 const train genr pre = $yhat genr mycoeff = coeff(train) The script runs fine until the last line. There it stops and tells me: ? genr mycoeff = coeff(train) Syntax error in genr formula Error executing script: halting I couldn't find any hints on a potential mistake in the documentation. Could anyone tell me what's wrong here? I am using gretl 1.5.0 (build date 01/17/2006) on Windows XP. Thanks for your attention. best wishes, jean