Dear R users:
I am dealing a data frame x as followings:
Date trade_day IV.b IV.a
1 2003-03-02 19 0.1724818 0.1815687
2 2003-03-02 18 0.1733542 0.1763827
3 2003-03-02 19 0.1753308 0.1783653
4 2003-03-03 16 0.1751217 0.1781624
5 2003-03-03 16 0.1738580 0.1768961
6 2003-03-03 19 0.1733346 0.1763800
......
I want to split the data flame into groups according to the variable "Date"
and "trade_day"
I tried: split(x,f=list(a=x$Date,b=x$trade_day)), but it doesn't work. How
can I solve this problem?
Thanks advance
Ted
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