hello everyone, I am new to statalist. Please pardon if the language is unclear. I am writing me thesis on impact of RCEP RTA and was running the command to estimate the gravity model with PPML estimator using command:
glm trade EXPORTER_FE* IMPORTER_FE1-IMPORTER_FE98 ln_gdpij contig comlang colony comcol ln_dist rta, family(poisson) link(log) nocons irls robust iter (30) cluster(pair_id).

At the end I get the result saying, ''convergence not achieved''.

What does this mean? How to rectify. Any help would be much appreciated.

Thank you much.