search for: dynamaically

...s anyone in the R-help list have experience writing an R wrapper that interfaces with the commercial packages LINGO and/or LINDO.api from R? I have a set of nonlinear/mixed integer problems that solve nicely with LINGO but I would like to use R to set the problems up and analyze/plot the solutions dynamaically. I have searched the archives and have not found any R packages that enable me to obtain solutions to mixed integer problems with linear and quadratic constraints. If I have missed one, we would be happy to hear which package we could consider as an alternative to LINGO. Any help or suggestions wo...

Dear Hao-pang, it is impossible to really tell the problem without a reproducible example. Just guessing: this looks like you have too many regressors. In GMM, lags of variables are used as instruments, so you might have more regressors than observations. Try reducing the 'lag' argument (which, by default, uses all lags available). Of course, the first observation to make would be that