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Dataset with duplicates and different values for the same variable

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Hi,
I was provided with a dataset of 4223 observation that contains duplicates ( copies >1; copies=2; copies=4 and copies=5). Seems that for 155 observations per person there are different values( sometimes missing values) for the same variable. I need a STATA commend which will tell to use definite values instead of missing values for that exact ID. Is there a way out of this situation? Would be very much appreciate if somebody helps me in this issue?
Thanks,
Lia

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