Hi all,
I have a big data set and want to remove rows conditionally.
In my data file each person were recorded for several weeks. Somehow
during the recording periods, their last name was misreported. For
each person, the last name should be the same. Otherwise remove from
the data. Example, in the following data set, Alex was found to have
two last names .
Alex West
Alex Joseph
Alex should be removed from the data. if this happens then I want
remove all rows with Alex. Here is my data set
df <- read.table(header=TRUE, text='first week last
Alex 1 West
Bob 1 John
Cory 1 Jack
Cory 2 Jack
Bob 2 John
Bob 3 John
Alex 2 Joseph
Alex 3 West
Alex 4 West ')
Desired output
first week last
1 Bob 1 John
2 Bob 2 John
3 Bob 3 John
4 Cory 1 Jack
5 Cory 2 Jack
Thank you in advance
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