Root Mean Square Error

Hi, I want to ask if it is possible for me to find the RMSE for

observation=444x15x7

model=300x15x7

[Star Strider]

No.

The matrices are of significantly different sizes that the necessary subtraction of them is not possible.

[Nurul Ain Basirah Zakaria]

Hi what if:

observation=400x1

model=300x1

Can I calculate the RMSE?

[Star Strider]

Again: No.

And for the same reason.