[R] How to select a subset?

[Malerba Giovanni]

I have a data.frame in which each individual has information on age,
gender, smoke and many other quantitative and qualitative data. How could
I prepare a new data.frame (or other - what?) where only 'male smokers'
are selected and in which there are all other variables available (to
perform the same analysis in a subset of individuals)?
Thanks in advance,
Giovanni Malerba



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