```Date: Tue, 17 Jun 2008 08:41:43 +0200 Reply-To: Reinhart Willers Sender: "SPSSX(r) Discussion" From: Reinhart Willers Organization: =?us-ascii?Q?Uni_Dusseldorf_Universitatsrechenzentrum?= Subject: Re: logistic regression when dependent variable is a ratio Content-type: text/plain; charset=us-ascii Good Morning, 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 values. c) Ratios near one: Apply he transformation y=1-x. You have case b. d) Other: ??? Change cut off values?? Arcus-Sinus-Transformation??? Transform the ratios in a binary variable (low high)?? Good Luck! Reinhart Willers > 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 > to > 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 > much! > -- > View this message in context: http://www.nabble.com/logistic-regression- > when-dependent-variable-is-a-ratio-tp17877437p17877437.html > Sent from the SPSSX Discussion mailing list archive at Nabble.com. > > ===================== > To manage your subscription to SPSSX-L, send a message to > LISTSERV@LISTSERV.UGA.EDU (not to SPSSX-L), with no body text except the > command. To leave the list, send the command > SIGNOFF SPSSX-L > For a list of commands to manage subscriptions, send the command > INFO REFCARD ===================== To manage your subscription to SPSSX-L, send a message to LISTSERV@LISTSERV.UGA.EDU (not to SPSSX-L), with no body text except the command. To leave the list, send the command SIGNOFF SPSSX-L For a list of commands to manage subscriptions, send the command INFO REFCARD ```

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