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From |
Maarten Buis <maartenlbuis@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: xtmixed with nonrtolerance. What happens? |

Date |
Fri, 24 Jun 2011 15:54:43 +0200 |

You seem to be under a time constraint, and getting this fixed is not going to be easy as that variable looks extremely problematic. Can't you change your dependent variable to a dummy, did that country export products of animal x or not, and than model it with -xtmelogit-? -- Maarten On Fri, Jun 24, 2011 at 3:26 PM, "Lukas Bösch" <L.Boesch@gmx.de> wrote: > sum quantity > > Variable | Obs Mean Std. Dev. Min Max > -------------+-------------------------------------------------------- > quantity | 6192 8545.829 116704.3 0 4019264 > > and here transformed: > sum centquantity2 > > Variable | Obs Mean Std. Dev. Min Max > > -------------+-------------------------------------------------------- > centquanti~2 | 6192 2.17e-09 1 -.0732263 34.3665 > > > The dependent variable is however not a real count. It was a count in the original dataset, or i think so, but i had to transform the original data and i am not sure wheter it still is a count as it involves dezimals, and transformed it even has negative numbers. I tried the xtmepoisson but it did not work at all. I didn't had the time to work on it as i had to go to work, so i will try it later. But for 1 thing, I surely cant work with the z-scores in xtmepoisson as negative numbers aren't alloud. The untransformed dependent variable also seems not to fit to the xtmepoisson criterias and it doesnt even start to calculate. > > The sample population are 40 countries. I started with 130 but because of the complexity of the data and because of all the missings i am working with 40 countries now. I have been told that i need a completely balanced data, and as i still have a representativ sample of countries i thought it would be allright. Having no missings in the data cant be wrong, was my thought. > > Thanks > > Lukas > > > -------- Original-Nachricht -------- >> Datum: Fri, 24 Jun 2011 08:54:45 -0400 >> Von: Anders Alexandersson <andersalex@gmail.com> >> An: statalist@hsphsun2.harvard.edu >> Betreff: Re: st: xtmixed with nonrtolerance. What happens? > >> I too would like to see the frequency distribution of your original >> dependent variable (i.e., before standardization). >> and, like Maarten, I would use xtmepoisson instead of xtmixed if the >> outcome variable is a count. >> >> Lukas, what is your sample population, e.g, the 40 or the 130 countries? >> Why do you need completely balanced data (no missing values)? >> >> Anders Alexandersson >> andersalex@gmail.com >> >> Lukas wrote: >> > 1) Concerning the missings, i took care to delete all data i don't have >> the complete time series for. >> > This means that i had to drop from 130 countries over a 20 years period >> to 40 countries over a 15 years >> > period. On the other hand, there are deffinitely no missing values. >> >> On Fri, Jun 24, 2011 at 6:30 AM, Maarten Buis <maartenlbuis@gmail.com> >> wrote: >> > --- On Fri, Jun 24, 2011 at 12:11 PM, "Lukas Bösch" wrote: >> >> One more information: >> >> >> >> When i run the modell only with the complete export time series. >> Without any zeroes in the dependent data, the output looks like this: >> > <snip> >> >> sd(R.genus) | 2.93e-06 .0221629 >> 0 >> > >> > I would not trust that result. First, leaving out 0s means you select >> > on your dependent variable, which is a very bad idea. Second, your >> > results indicate that the genus variation is de facto 0 (2.93e-6 = >> > 0.000000293), which given your context is very unlikely. >> >> * >> * For searches and help try: >> * http://www.stata.com/help.cgi?search >> * http://www.stata.com/support/statalist/faq >> * http://www.ats.ucla.edu/stat/stata/ > > -- > Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir > belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > -- -------------------------- Maarten L. Buis Institut fuer Soziologie Universitaet Tuebingen Wilhelmstrasse 36 72074 Tuebingen Germany http://www.maartenbuis.nl -------------------------- * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: xtmixed with nonrtolerance. What happens?***From:*"Lukas Bösch" <L.Boesch@gmx.de>

**Re: st: xtmixed with nonrtolerance. What happens?***From:*Stas Kolenikov <skolenik@gmail.com>

**Re: st: xtmixed with nonrtolerance. What happens?***From:*"Lukas Bösch" <L.Boesch@gmx.de>

**Re: st: xtmixed with nonrtolerance. What happens?***From:*Joerg Luedicke <joerg.luedicke@gmail.com>

**Re: st: xtmixed with nonrtolerance. What happens?***From:*"Lukas Bösch" <L.Boesch@gmx.de>

**Re: st: xtmixed with nonrtolerance. What happens?***From:*Joerg Luedicke <joerg.luedicke@gmail.com>

**Re: st: xtmixed with nonrtolerance. What happens?***From:*"Lukas Bösch" <L.Boesch@gmx.de>

**Re: st: xtmixed with nonrtolerance. What happens?***From:*Joerg Luedicke <joerg.luedicke@gmail.com>

**Re: st: xtmixed with nonrtolerance. What happens?***From:*"Lukas Bösch" <L.Boesch@gmx.de>

**Re: st: xtmixed with nonrtolerance. What happens?***From:*"Lukas Bösch" <L.Boesch@gmx.de>

**Re: st: xtmixed with nonrtolerance. What happens?***From:*Maarten Buis <maartenlbuis@gmail.com>

**Re: st: xtmixed with nonrtolerance. What happens?***From:*Anders Alexandersson <andersalex@gmail.com>

**Re: st: xtmixed with nonrtolerance. What happens?***From:*"Lukas Bösch" <L.Boesch@gmx.de>

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