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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