[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

From |
Reza C Daniels <rdaniels@commerce.uct.ac.za> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: RE: Generating skewed distributions on closed intervals |

Date |
Thu, 29 Sep 2005 12:33:43 +0200 |

Hi Maarten,

I tried this in the following way:

set obs 100

-gen z1=invnorm(uniform())- where z>0

-gen z2=ln(z1)- for positively skewed

-gen z3=exp(z1)- for negatively skewed

As I'm sure you know, this gives me the correct shape of the distributions I'm looking for, but the incorrect range.

So, I still can't solve it.

Thanks anyway,

Reza

Maarten Buis wrote:

It reminds me of an ordered probit problem: you have one unobserved distribution, which is being carved up. Only now you also have information about where the cuts are made. This should be solvable. You might want to look at the log normal instead of the normal though, since no one can get, or has ever been, -2 (even with plastic surgery). -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of Nick Cox Sent: donderdag 29 september 2005 11:09 To: statalist@hsphsun2.harvard.edu Subject: RE: st: RE: Generating skewed distributions on closed intervals Well, I guess wildly the literature you are unaware of holds better solutions, but that's an empty comment as I don't know what it is. The idea that an age distribution is a bunch of little truncated Gaussians sitting next to each other on a line sounds at best strange to me, but as I said I don't understand what your problem is. Nick n.j.cox@durham.ac.uk Reza C DanielsThere is a literature on this problem that I am aware of. I'm just having trouble with the code in Stata to generate my required results.Whatever your problem is, it is difficult to believe that there is not a literature on it, e.g. in demography, actuarial science, population ecology.* * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

* * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**RE: st: RE: Generating skewed distributions on closed intervals***From:*"Maarten Buis" <M.Buis@fsw.vu.nl>

- Prev by Date:
**RE: st: RE: Generating skewed distributions on closed intervals** - Next by Date:
**Re: st: RE: Generating skewed distributions on closed intervals** - Previous by thread:
**RE: st: RE: Generating skewed distributions on closed intervals** - Next by thread:
**RE: st: RE: Generating skewed distributions on closed intervals** - Index(es):

© Copyright 1996–2014 StataCorp LP | Terms of use | Privacy | Contact us | What's new | Site index |