I have two list, the first list stores information such as person's id , shopping dates, and shopping value.
person ID date Value
a 2015-01-01 15
a 2015-02-15 150
b 2015-11-01 30
c 2015-12-21 45
The second list also contains the person ID as well as income information, such as
person ID income
a 1500
b 985
c 2110
What I want is to append the income information into the first list, like this
person ID date Value Income
a 2015-01-01 15 1500
a 2015-02-15 150 1500
b 2015-11-01 30 985
c 2015-12-21 45 2110
How can I do that in R ?
Maybe it is a duplicated question, but I fail to find out what I want.
