Hello,
I have a big dataset with many variables and I would like to consider
only the rows in which there is a specific value of a variable.
I make an example for explain what I mean:
I have 5 variables describing a person: age, sex, weight, colour of
hair, colour of eyes.
I have 1000 rows (1000 persons) and I want to consider only the persons
whose age is between 20 to 30. How can I do?
Thank you very much
M.
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