[R] plz help. how to filter/group/sort data on mass data

[Jeff Newmiller]

type

??lag

at the R command line.
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Sent from my phone. Please excuse my brevity.

bestbird <bestbird7788 at gmail.com> wrote:

> I have know how to sort and filter and group.
>can anyone answer my another question?
>Is there any function in R like *lead *and *lag * in SQL. They are
>relative
>position function. We can use them to solve problem such as : on
>year-on-year basis, link relative ratio
>
>can anyone give a tips?
>
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