Trivial question: what does f. stand for?

[Oscar Weinzettl]

Sorry if this is obvious, but I cannot find an answer

As an example

gen treatment=0 if (expectation==2 & f.gift_received==2) | (l.expectation==2 & gift_received==2)

what does the f. infront of gift mean? l. infront of expectation means lagged, that I know. But I don't know what f. stands for or what it is.

[Nick Cox]

Time series operator giving value at next time.

[Oscar Weinzettl]

Thank you!

[Scott Merryman]

see

help tsvarlist

        Operator  Meaning
        ---------------------------------------------------------
        L.        lag (x_t-1)
        L2.       2-period lag (x_t-2)
        ...
        F.        lead (x_t+1)
        F2.       2-period lead (x_t+2)
        ...
        D.        difference (x_t - x_t-1)
        D2.       difference of difference (x_t - 2x_t-1 + x_t-2)
        ...
        S.        "seasonal" difference (x_t - x_t-1)
        S2.       lag-2 (seasonal) difference (x_t - x_t-2)
        ...
        ---------------------------------------------------------

[Oscar Weinzettl]

Thanks Scott, didn't know where it was stored. Tried searching for f. but couldn't find anything. Will keep this in mind!