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From |
"Lucia R.Latino" <Latino@economia.uniroma2.it> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
R: st: q-q plots, theoretical distribution with values higher than the sample's cutoff point |

Date |
Wed, 18 Jul 2012 19:23:10 +0200 |

Dear Nick, Thanks for your answer. Here you have the details of my variable. I hope it can be more useful to give me some feedback. -su dec_ae, d - -------------------------------------------------------------------- Percentiles Smallest |---------------------------------------| 1% 838.9864 11.1115 5% 1402.251 38.77081 10% 1733.309 112.4597 Obs 11183 25% 2352.013 116.3163 Sum of Wgt. 11183 50% 3209.503 Mean 3518.48 Largest Std. Dev. 1648.996 75% 4355.16 9948.422 90% 5793.742 9952.207 Variance 2719189 95% 6790.232 9981.6 Skewness 1.017932 99% 8768.935 9992.487 Kurtosis 4.138746 ------------------------------------------------------------------ Thanks, Lucia -----Messaggio originale----- Da: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Per conto di Nick Cox Inviato: mercoledì 18 luglio 2012 18:49 A: statalist@hsphsun2.harvard.edu Oggetto: Re: st: q-q plots, theoretical distribution with values higher than the sample's cutoff point These programs are in package -qpfit- on SSC. The word "problem" here is ambiguous. My bias is to guess that your data don't follow any of these distributions very well and the graphs are telling you that. -su dec_ae, detail- would tell us a bit more. Nick On Wed, Jul 18, 2012 at 5:13 PM, Lucia Latino <Latino@economia.uniroma2.it> wrote: > I am having some problems with the q-q plots for Dagum, gb2, lognormal > and Singh-Maddala distributions using programs written by Nick Cox. > > After having fit the distribution (e.g. lognfit dec_ae, svy), I run > the command for the q-q plot (e.g. qlogn dec_ae [pweight=iwght]). > > I repeat the same procedure for the other distributions (Dagum, gb2 > and Singh-Maddala). All the plots show a strange behavior: in all the > qq-plots, the points follow a strongly nonlinear patters. At the > beginning they follow the 45 degree line, then they depart > significantly from the 45 degree line and become flat around the value 10,000, which is the max value for dec_ae. > > What does it mean? Why the theoretical distribution takes value higher > than 10,000? > > I hope I was clear enough. I wish I could show you the plots, but I > understood I cannot attach them. > * * 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/ * * 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/

**Follow-Ups**:**Re: st: q-q plots, theoretical distribution with values higher than the sample's cutoff point***From:*Nick Cox <njcoxstata@gmail.com>

**References**:**st: q-q plots, theoretical distribution with values higher than the sample's cutoff point***From:*Lucia Latino <Latino@economia.uniroma2.it>

**Re: st: q-q plots, theoretical distribution with values higher than the sample's cutoff point***From:*Nick Cox <njcoxstata@gmail.com>

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