[R] Calculation of lags

[Ronaldo Reis-Jr.]

Hi,

If I have the follow situation:

A dependent variable (i.e. number of insects) that is affected by an 
independent variable (i.e. rain). The problem is that the measure of rain 
affect the population in other moment. So there exit a lag between the rain 
and the number of insects. Exist in R any tool to find what is this lag? 

Explain better.

Suppose that I have a linear relationship between rain and insects. More rain 
make more insects. If I try to model the rain and insects in the same moment 
I cant see this relationship because the rain today affect the number of 
insects in the future. Thus, I need to model the present rain with the number 
of insect in the future. But when is this future? 1 day after, 2 days after, 
etc.

How the best way to calculate this lag?

Thanks
Ronaldo
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