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Update all the odd rows in a field with the value in the row above.

Question asked by cemitten on Jan 10, 2014
Latest reply on Jan 10, 2014 by Caleb1987
I need to update a field  where all of the even rows have a value and the odd row below needs that value assigned to it as well. 
This needs to become  This
1        -                       1
0        -                       1
2        -                       2
0        -                       2
1        -                       1
0         -                      1

I ideally would like to run the code as a calculate field within model builder.

For more information every two rows has the same ID. For example the first 2 rows have ID A the next two, B.  I don't know if this would help solving those second values or not.