That could be a very broad question and get into proprietary information.
If you provide an example with simulated values of the type of data you have, what you are reconciling with and what the expected result would be you may get a more useful response.
Whoever has asked you to do a "bank reconciliation" must have a clear idea of what they want. Clarify with them what they mean specifically. Reconcilliation is just a general term that can be applied to many different tasks looking at data in different ways. We can't help you until provide us with more details of your requirements.
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Learn the difference between classical and Bayesian statistical approaches and see a few PROC examples to perform Bayesian analysis in this video.
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