Date: Tue, 17 Jun 2008 08:41:43 +0200
Reply-To: Reinhart Willers <firstname.lastname@example.org>
Sender: "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From: Reinhart Willers <email@example.com>
Subject: Re: logistic regression when dependent variable is a ratio
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if you can't apply David's solution, an ANOVA is the second choice, but you
can't uses this tool in any case:
a) Ratios between 0.3 and 0.7:
No problem. The variance of the ratios should be nearly constant.
b) ratio near zero (<0.1):
A logarithmic transformation stabilises the variance and avoids meaningless
c) Ratios near one:
Apply he transformation y=1-x. You have case b.
d) Other: ???
Change cut off values??
Transform the ratios in a binary variable (low high)??
> Betreff: logistic regression when dependent variable is a ratio
> can someone plz help me with this:
> if my dependent variable is a ratio (ie the ratio of events that have a
> specific property, so it will only take on values between 0 and 1, then
> should i be using logistic regression? I know that logistic regression is
> be used when your dependent variable can take on a discrete number of
> possible values, but in this case my dependent variable can take on any
> value in the continuous interval from 0 to 1. any ideas if logistic
> regression or just normal linear regression would work here? thanks so
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