[R] the opposite of lag() in panel data

[Cecilia Carmo]

Hi R-helpers

 

I want a function that performs the opposite of lag() with panel data.

I have transformed my data before with pdata.frame(mydata,
index=c("groupindex", “timeindex"))

And then I’ve done lag(mydata, -1) but it doesn’t work. 

 

The error message was:

Error in rep(1, ak) : invalid 'times' argument

 

Thank you in advance,

 

Cecília Carmo


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