Hi, is there a summary somewhere about what works and what doesn't with X-13, as opposed to X-12? I know that on the main gretl web page --plus the Windows and Mac pages there-- X-13 is offered for installation. From time to time there is some discussion on the mailing lists on how to use it as a drop-in replacement for the older X-12. But gretl's documentation basically never mentions it it seems. Examples: - web page: http://gretl.sourceforge.net/x12a/x12a.html - built-in strings: $x12a and $x12adir - estimation option --x-12-arima to the "arma" command; and associated command ref plus section 31.2 in the guide - menu entry Variable/X-12-Arima analysis My understanding is that all this works when the user sets the path to the installed X-13 right. Is this summary correct? Is there any advantage these days to use the older X-12 instead of X-13? Especially if the last answer is no, I guess all the references above could be changed to refer to x13. If coexistence is wanted I could mention this in the guide somewhere. But maybe I'm missing something. thanks sven