A bug for XY scatterplots in gretl:
1. Plot a XY scatterplot from View > Graph specified vars > X-Y scatter...
2. Click on the graph to obtain the pop-up menu and choose Edit > Main >
Fitted line > quadratic > OK
3. Click on the graph to obtain the pop-up menu: The "OLS estimates" menu
entry has disappeared.
Best regards
Andreas Karlsson