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Thread: inteff-command after fitting a probit model in Stata -> Graph with interaction effect

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    inteff-command after fitting a probit model in Stata -> Graph with interaction effect




    Hello,

    (For people who are familiar with the inteff-command, skip the first two paragraphs and just read the third paragraph)

    I run a probit model with the interaction term GindexHHI and the separate terms Gindex and HHI (Gindex = governance strength; HHI = industry concentration). All other variables are performance control variables. The dependent variable takeovercompleted equals takeover likelihood, coded as a binary dummy variable.
    -> probit takeovercompleted SalesGrowth Liquidity DEratio MBratio PEratio Size Gindex HHI GindexHHI

    After the probit model, I compute the marginal effect of the interaction term GindexHHI. I do this by applying the inteff-command after the probit model which computes the cross-partial derivative of the interaction term (which corresponds to the correct marginal effect of the interaction term)
    ->inteff takeovercompleted SalesGrowth Liquidity DEratio MBratio PEratio Size Gindex HHI GindexHHI


    I get a graph with the marginal effect of the interaction term (interaction effect in %) and a graph with z-statistics of the interaction term to derive the stat. sign.

    Firstly, Stata shows the graph with the interaction effect and then overwrites this graph with the graph for the z-statistics of the interaction effect. However, I need to show both graphs in my research. I can only copy the graph with z-statistics at the moment. How can I tell Stata to show both graphs or to show them separately?


    Example of the output (standard error omitted)

    Variable | Obs Mean Std. Dev. Min Max
    -------------+--------------------------------------------------------
    interaction effect | 136 -.2959831 .1422207 -.3679685 .290872
    z-statistic | 136 -1.288604 .800488 -2.093989 2.513241

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    Re: inteff-command after fitting a probit model in Stata -> Graph with interaction ef

    I've been looking for a command like inteff. But it does not seem to work for me, neither for mlogit or mprobit. I've got STATA 11. OnT: Sorry, can't help.

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    Re: inteff-command after fitting a probit model in Stata -> Graph with interaction ef

    ok, thanks anyway...I just use a probit model and it works, disregarding the small problem that I described above... I do not know what is mprobit at all...
    There is a paper called: "Computing interaction effects and standard errors in logit and probit models", The Stata Journal (2004), Vol. 4, No. 2, by Norton, Wang and Ai

    Maybe this paper can help you...

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    Re: inteff-command after fitting a probit model in Stata -> Graph with interaction ef

    Thanks, I'll check it out. mprobit is a multinomial probit model. A model where the DV takes on more than two values.

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    Re: inteff-command after fitting a probit model in Stata -> Graph with interaction ef

    Ok, I think this paper only refers to "normal" probit and logit models...but I am not totally sure..

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    Re: inteff-command after fitting a probit model in Stata -> Graph with interaction ef

    I haven't used -inteff- but it looks like you need to use the savegraph1() and savegraph2() options documented in -help inteff-

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    Re: inteff-command after fitting a probit model in Stata -> Graph with interaction ef

    Hi bukharin,

    I tried that with savegraph1 and savegraph2, but it does not work, I get the error message r199 below.
    I use "F:\MASTER THESE MAASTRICHT Oct2011 - Backup\Most essential data\Stata11.2" as my current working directory...


    Output:
    inteff takeovercompleted Gindex HHI GindexHHI SalesGrowth Liquidity DEratio MBratio PEratio Size Buseq Chems Durbl Enrgy Hlth Manuf Mo
    > ney Nodur Other Shops Telcm Utils
    Probit with two continuous variables interacted
    (10359 observations deleted)

    Variable | Obs Mean Std. Dev. Min Max
    -------------+--------------------------------------------------------
    _probit_ie | 100 -.9049926 .5553251 -1.990601 1.025768
    _probit_se | 100 .6795854 .2501268 3.65e-21 1.491133
    _probit_z | 100 -1.243099 .7676063 -2.290685 1.018358

    .
    . savegraph1(F:\MASTER THESE MAASTRICHT Oct2011 - Backup\Most essential data\Stata11.2\Figure1ieinperc, replace)
    unrecognized command: savegraph1
    r(199);

    .
    . savegraph2(F:\MASTER THESE MAASTRICHT Oct2011 - Backup\Most essential data\Stata11.2\Figure1ieinperc, replace)
    unrecognized command: savegraph2
    r(199);

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    Re: inteff-command after fitting a probit model in Stata -> Graph with interaction ef

    No, savegraph1() and savegraph(2) are options for -inteff- - you need to use them after a comma on the same line as the -inteff- command. See -help language-

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    Re: inteff-command after fitting a probit model in Stata -> Graph with interaction ef


    yes indeed. It works now. Thanks a lot.

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