Thank you for your answer, but i still have some questions upon your answer
Q1, as you said " With a 1 where there should normally be a gap for Jose row. If you modify that slightly to be:",
where is the slight modification? I don't find any change on your second code example, and I run your former two code examples,
both return the same as below:
Q2, what does the dlm= "¬" mean?
Q3, as for your third code example, it does work if the columns are separated by a "," , but in my datafile (see attached), they are separated by a space, so I still don't know why it is correct only when I add +1 after the variables of age and type (even add +1 for all the variables, it doesn't work)?
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