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  • Fixed Effects and "Characteristic contents too long. The maximum value of the contents is 67,784"

    Dear Statalist community,

    I am a STATA/MP 14 users trying to deal with the “characteristic contents too long. The maximum value of the contents is 67,784” problem.
    More precisely I am running some regression discontinuity and, given that I have to account for crucial fixed effects, I manually add those among the controls. Since factor variables seem not allowed, I must rely on the xi prefix.
    I am aware that such xi prefix is obsolete and most of the time brings to troubles, but my guess is that resorting to it is the only solution.
    Here a simplified code summarising what just said:
    Code:
    xi:rdrobust Y Running_Variable, c(0) covs(X1 X2 Xn i.year*i.region_code i.id_towns)
    As an extrema ratio, I actually may drop some observations, but I would do that in some further robustness exercise (motivated by other arguments other than computational issues).
    Any thought on this issue?

    Thank you in advance,
    Pasquale

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