I wrote a guide to run gravity models in stata. Here: https://www.researchgate.net/publication/351154064_International_trade_and_the_gravity_model_recent_evidence_in_theoretical_and_empirical_analysis.

Here you go: https://sites.google.com/site/hiegravity/

and https://transportgeography.org/contents/methods/spatial-interactions-gravity-model/?

Both Carolina Corrêa and Tom Broekel have given you considerable insight. Pay attention to theoretical underpinnings implicit in their work.

Here is a theoretical article . . . no numbers: Article Central place theory and the simple economic foundations of ...

My thanks for all the responses. I've also found this particular video that was very useful: https://www.youtube.com/watch?v=hOEwc1anN-E

Here you can find good information: https://www.academia.edu/download/54807240/2._TRADE_POLICY_ANALYSIS.pdf

Hi,

please checkout:

* Santos Silva, J.M.C. and Tenreyro, Silvana (2006), The Log of Gravity, The Review of Economics and Statistics, 88(4), pp. 641-658.

(https://personal.lse.ac.uk/tenreyro/lgw.html)

good luck!