what to separate missing data how do you merge missing data and don't know how to merge missing data into don't know in r what should missing data be in a survey what is the difference between na and don't know how can i get a missing and don't know in survey data? when you combine the don't know and missing data rows in one, you create a new one. what to use to separate the don't know from missing data what is the difference between missing data and don't know can we separate the missing data in survey what is missing data data mean what is the difference between missing data and survey data can you merge missing data and don't know how to separate incomplete information and missing data r why should survey data be naming missing data what is the meaning of missing data what is na in r can a survey report be analyzed in r how do i merge missing and don't know in r do i merge missing data into don't know?