Answer Posted / madhupamuluri

Nodup or noduprec: It deletes duplicate observations (the observation repeated more than one time in a dataset) by using all the variables which are available in the input statement.

Nodupkey: It deletes duplicate data values(the value is repeated more than one time in a variable)as well as duplicate observations (the observation repeated more than one time in a dataset) by using the key variable which are available in the by statement.

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