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  • OA Stata
    replied to xtpoisson vs ppml
    Dear Joao,

    I'd like to get the error bands for my predictions. I just want to show a measure of uncertainty on my predictions and was wondering...
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  • OA Stata
    replied to xtpoisson vs ppml
    Dear Joao,

    Now that I have my PPML gravity model and the corresponding predictions ready (through -xtpoisson- and with country-pair fixed...
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    Last edited by OA Stata; 01 Mar 2019, 04:09.

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  • OA Stata
    replied to xtpoisson vs ppml
    Perfect, Joao. Thanks a million for everything :-)

    Ainhoa
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  • OA Stata
    replied to xtpoisson vs ppml
    Thanks Joao. Sorry, an example might be easier for me to explain. My historical data for migration is 1960-2010 (every ten years), and my projection period...
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    Last edited by OA Stata; 18 Feb 2019, 03:03.

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  • OA Stata
    replied to xtpoisson vs ppml
    Thanks a lot, Joao, I'm really grateful for your help.

    Should the "yhat" component of exp_alpha include just the fitted values...
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  • OA Stata
    replied to xtpoisson vs ppml
    Many thanks again, Joao. The problem is that I would have way too many country-pair dummies (more than 40,000) and Stata doesn't have memory to store...
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    Last edited by OA Stata; 15 Feb 2019, 08:14.

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  • OA Stata
    replied to xtpoisson vs ppml
    Dear Joao,

    Apologies for getting in touch again, but I need to clarify this and your advice is really important to me.

    Thanks...
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  • OA Stata
    replied to xtpoisson vs ppml
    Many thanks for that, Joao. I really appreciate it. I have a last-minute urgent doubt, I'd be extremely grateful if you could give me your view. I need...
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    Last edited by OA Stata; 14 Feb 2019, 12:04.

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  • OA Stata
    replied to Gravity model with ppml command
    Perfect, Joao. Thanks a million for that.

    Ainhoa...
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  • OA Stata
    replied to Gravity model with ppml command
    Thanks Joao. Just a fundamental question: can PPML be used when the dependent variable is a rate? I'm using it for a gravity model where the dependent...
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  • OA Stata
    replied to xtpoisson vs ppml
    Dear Joao,

    Thanks a million for that. I checked and I've made the code below for the prediction (the estimation is as per comment #18 in...
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  • OA Stata
    replied to xtpoisson vs ppml
    Apologies for getting in touch again, but if you could please take a look at this, I'd really appreciate it. It's quite urgent and I need to clear this...
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    Last edited by OA Stata; 08 Feb 2019, 09:30.

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  • OA Stata
    replied to xtpoisson vs ppml
    Thanks. I tried that before but I get an error "too many values" r(134). This is because I'm trying to create 40,000+ dummies (since I have...
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    Last edited by OA Stata; 08 Feb 2019, 05:32.

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  • OA Stata
    replied to xtpoisson vs ppml
    Dear Joao,

    One last question: how can I include country-pair fixed effects in the ppml command from post #9? The dummy I showed there referred...
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    Last edited by OA Stata; 07 Feb 2019, 11:37.

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  • OA Stata
    replied to Gravity model with ppml command
    My fear is that these fixed effects have really high coefficients compared to the rest of the time-varying variables of my model. This might be contributing...
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