Understanding Society User Support

Hi

When comparing the variable b_ff_oprlg with information merged in directly from Wave 1 using variable a_oprlg - I find small discrepancies and greater missingness on b_ff_oprlg. For example there are 583 cases with an appropriate response on a_oprlg who are recorded missing on b_ff_oprlg. Please could you let me know why that is, or whether it is better to use information from a_oprlg.

Many thanks

Andy