Combining values of multiple columns into one column
I have a data set where I would like to merge four columns into one column, so thatthe values of the four columns are displayed in one column. However, I have no clue how to do that.I have four conditions, which respondents have been exposed to depending on the day of the monththey are born. If a respondent has been exposed to Condition 1 it shows a 1 and the same forconditions 2,3, and 4. How ca...