Hi all,
One of the the columns of a data frame has a value such like
AAAAS-2001-yy
AAAAS-2004-xx
FFFFF-2007-SS
and so on
based on this column (variable) I want subset a data frame where the
middle value of this variable is between 2001 to 2004.
THE END RESULT THE DATA FRAME WILL BE THIS.
AAAAS-2001-yy
AAAAS-2004-xx
THANK YOU IN ADVANCE
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