Talk:Logistic distribution

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[edit] Images

I'm having trouble with the images, the density function one in particular.

It appears the expression as it appears in the article is not what was plotted for the images; it would help tremendously if someone could put up a working image, or just explain what the difference is.

Otherwise, I'll take out the images for now?

RandomP 20:02, 16 June 2006 (UTC)

Okay, the image has been fixed in the commons. I'd taken it out for the intervening period, and Carbonate (talk ยท contribs) put it back in after it was fixed (though, er, I'm not making sense of his edit summary). Everything's okay then.

RandomP 14:02, 18 June 2006 (UTC)

[edit] Applications

How about something on what applications are? For intance, it is used in the Elo rating system for chess players. RJFJR 18:10, 16 October 2007 (UTC)

I agree, addition of applications is absolutely essential to the content of this page. In particular, I think it ought to be mentioned where these distributions tend to occur in nature, and what causes things to follow such a distribution. Cazort 17:11, 1 November 2007 (UTC)

[edit] Generalized log-logistic distribution

I've just removed this section because:

  • It doesn't really belong here as its a different distribution and needs a separate page
  • It doesn't give any references and i don't think the formulae are correct as they are incompatible with the log-logistic distribution (i.e. there is no value of the parameters for which the given formulae reduce to the form of the log-logistic distribution)
  • Googling Generalized log-logistic distribution gives several different forms (unfortunately there's always more than one way of generalizing something) but none appear the same as that given.

I've archived the content at a subpage /Generalized log-logistic distribution so if you disagree you can reinstate it if you can give a citation to a reference.--Qwfp (talk) 22:25, 31 January 2008 (UTC)

I've just merged this into log-logistic distribution as a new section log-logistic distribution#shifted log-logistic distribution. On further investigation it turns out there are a number of different distributions sometimes known as the generalized log-logistic. The alternative name "shifted log-logistic" which is sometimes used is more descriptive and less ambiguous. The formulae were correct and it does reduce to the log-logistic for certain combinations of the parameters (so struck out some of my comment above), it's just a bit more complicated than you might expect. It could be a separate article, but its so closely related to the log-logistic that it seems better this way. --Qwfp (talk) 17:56, 15 February 2008 (UTC)

[edit] Characteristic function

Is the restriction given for the range of "t" correct here. I don't think you can just substitute "it" for "t" in the range required for the MGF, where "t" is implicitly real. Melcombe (talk) 17:49, 13 March 2008 (UTC)