In-sample prediction

Hello, I am trying to carry out an in sample-prediction analysis for a DSGE model but I am not sure if I am considering the correct output.
I am using the oo_.FilteredVariables.Mean in order to obtain the Forecast error. Is this correct?

Thank you in advance.

When you say

what is the information set you have in mind? The filtered variables contain the forecast of t+1, given the information up to time t.

Primarily, thank you for the answer.
What I want to get is the the difference between the data generated by the model and the actual data in order to compute the bias. Therefore I guess I just have to subtract from the actual data the filtered variables.

Thank you again