Dear all,
Does R have function or method to finish the following task.
Say i have a dataset. The response variable is Y, and the indepedent
variables are X1, X2, X3, and YEAR. See an example.
Y X1 X2 X3 X4 YEAR
13.4 2.8 3.5 2.5 1.8 1990
10.5 1.8 2.4 2 3 1991
.... .....
In ecology, Y may be not only related with X1, X2, X3 in the same year as
Y, but also may be related with X1, X2, X3 and Y in the previous one , two
or more years as Y. But which year has the closest relationship is not know
and this may be one of the analysis aim.
Take Year=1995 as an example,
Y_1995 may be related with
X1_1995 , X2_1995 , X3_1995,
X1_1994 , X2_1994 , X3_1994, Y_1994, (previous one year)
X1_1993 , X2_1993 , X3_1993, Y_1993 (previous two years)
... ...
(previous more years)
Pay attention to the situation that Y itself may also affect its own value
of the next several years.
Anybody knows whether R have functions or methods to
finish the above task.
I hope i have explained it clearly. Any suggestions or help are greatly
appreciated.
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