relative RMSE?

[ptompalski]

I was a bit surprised not to see relative RMSE included in the {yardstick} package. In my work, the standard set of metrics for reporting model performance typically includes both absolute RMSE and relative RMSE.

Am I perhaps overlooking something? Is there an existing metric in {yardstick} that is equivalent to relative RMSE but named differently?

I understand that the package allows users to define custom metrics, and I’m happy to create my own (or even submit a PR to add relative RMSE to {yardstick}). However, I wanted to check first to ensure I’m not missing something obvious.

PS: relative_RMSE = RMSE / range(response)