any way to center a variable without a higher-order polynomial?

[adw96]

I'm reviewing the lincom inclusion in the vignette ( ❤️ ❗ ) I was wondering if it's possible to center a variable without a higher-order polynomial? I tried mod_rigr <- regress("mean", atrophy ~ polynomial(age, degree = 1, center = 65) + sex + height + weight, data = mri) but received "inappropriate degree of polynomial" error.

No need to implement if not already in there but thought one of you would know if it was 🙏

[taylorokonek]

There's no good way to center a variable directly in a regress call, you'd have to do it externally, like mri$age_centered <- mri$age - mean(mri$age), or something like that. Could be a future enhancement, to include a center() function, that one could use as regress("mean", atrophy ~ center(age), data = mri)

[adw96]

Thanks @taylorokonek !