broom::tidy method for msm models

[chjackson]

broom::tidy method for msm models

[larmarange]

In case it could be useful for watching what could be the result of some tidiers for msm, a draft of very basic tidiers could be found at https://github.com/larmarange/JLutils/blob/master/R/tidy_msm.R

Best regards

[chjackson]

I think this would be a great addition, but adding new features to msm is low priority for me at the moment. So I'd encourage others to write these, as you have done, especially since a feature like this doesn't need to know msm internals. I'll make a note to test out what you've written - I've not used broom myself, but I like tidyverse stuff.

[larmarange]

Thanks for considering it.

Just quick notes:

• the current draft relies on tidyr and dplyr but it should be possible to rewrite them if you want to avoid importing some of their functions
• for simplicity, I just wrote tidiers for the output of prevalence.msm and hazard.msm. For a better implementation, it should be possible to add a class to the output of each of these functions, so it would be possible to call directly tidy(prevalence.msm(model)).
• to be more generic with broom, it would be nice to have a tidy method that could be applied directly to a msm model, with the same generic arguments that those used in other model tidiers. However, it will require to clarify that should be returned in that case. Maybe the hazard ratios?

Regards