Entering a caret within a Latexed expression: Ends up mangled...

[WWGD]

TL;DR Summary

How to write Latex for ##y_i## with a caret , i.e., y^_i?

Hi,
Trying to Latex in an estimator y^ together with an index, y_i . The latter is obvious as ##y_i##, but I can't get the estimator ^ without mangling it all.
Any ideas?

 

[Orodruin]

##\hat y_i##?

 

[WWGD]

##\hat y_i##?

Thank you.