Using RooUnfoldspec class

ROOT
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Dear experts,

I am using RooUnfold for implementing Iterative Bayesian unfolding. I recently came across the RooUnfoldspec (tutorial) and had some basic questions regarding that:

  1. How exactly should I fill my response?
    I have two separate ROOT files and here is what I have in mind: I should filter the events based on eventnumber and runnumber from reco and true level, fill a th2d with those events and this will be my migration matrix. I feel that I still need correction factors (acceptance and efficiency). Should my response be equal to R = (eff * migration)/acc? and will this response be one of the inputs in RooUnfoldspec object?

  2. Do I need an UnfoldingMatrix under RooUnfoldBayes while using RooUnfoldspec? If yes, how should I make use of it.

Regards,
Nilima.