r - Should I assign NULL or NA -


i looking advice on use of null , na in data set. specifically, have fishery data independent observers. data consists of patrol information variables such patrol_distance, patrol_time, etc, , fishing information variables such angler_count, fish_count, etc. question is: assign cases no anglers counted, null or na. need computational summaries on these variables , later export database (ms access).

i have done reading on use of null , na, require clarification.


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