Currently the Help Center > Asking states that questions are on-topic if they're about "statistical analysis, applied or theoretical", and whenever it's about programming "if it needs statistical expertise to understand or answer". This also is the topic of this meta discussion.
Shouldn't therefore questions concerning the implementation of a particular statistical model in different software be on-topic on Cross Validated (CV)?
What happened: A few days ago I encountered the problem of how a specific statistical "far from trivial" model can be implemented in R rather than in Stata. Google's results were rare and one pointed me straight to this question on CV which gave me valuable hints, but the solution was not provided. I had to do quite an amount of extra research and after I found a solution, and after I've convinced myself that the same statistical method is being used, I wrote an answer to share my insights with the OP and the community.
Just after I've posted my answer, the question was closed as off-topic. I am wondering why, since the OP has written his question in a "general format" and elucidates "underlying statistical methods" as demanded in this meta discussion.
Rather, perhaps my answer is somewhat off-topic, as it does not contain much statistical explanation. The question hasn't been migrated to Stack Overflow (SO), since it might be a "borderline question" in terms of @Shog9. IMO it therefore shouldn't have been closed on CV.
My point is that on CV answers to questions about how a certain statistical model X can be implemented in software Y (perhaps with an unknown package Z) are often invaluable. I personally doubt to get statistically valid answers on Software Recommendations or r-help - as some suggest where to ask such questions - when things enter non-trivial statistical areas. I would most likely trust answers or consider them significant if they are right here on CV. There are several other similar questions which are not closed, e.g.: 1, 2, 3, 4, 5. I have found several of them to be really useful. Some such questions would be off-topic on SO since they are "too broad", for example this question, or doesn't contain a MCVE, for example this question. Further asking to "recommend or find a book, tool, software library, tutorial or other off-site resource" is off-topic on SO as also noted in @Tim's CV meta question.
I consider CV as an invaluable resource of such model implementation questions in different software and I would be disappointed to see that to change.
I'm aware that this topic has its history. Maybe my question contributes to some further differentiation (from e.g. pure programming R questions). This answer doesn't fit to the type of questions since it doesn't cover model implementation in different software.
Also this community wiki isn't suitable to the question since it is not purely software-related and needs a statistically educated brain to give an adequate answer which can't be a entry on a simple package list.