# Estimation method for ratio dependent variable?

#### gabeo

##### New Member
Hi,
Logistic regression is used if the dependent variable is a discrete choice variable. My dependent variable is not a discrete choice variable, but a ratio one.
Is it possible to use regression model with using tranformation for dependent variable? or use some other types of estimation?

Thanks

#### Dason

Can you explain your overall goal? Why do you want to use logistic regression?

#### gabeo

##### New Member

There are three products A, B. An individual choose proportion of his or her fixed a amount of money spent on each product. I want to estimate the effect of demographic factors on this choice

This is not discrete choice between A and B. Hence, It can not be measured by a dummy variable and the pure logistic model cannot be used.

It is a ratio (or proportion of money spent on each product), ranging from 0 to 1.

I wonder if I should transform the ration (or portion p) in to
Y = ln ((p / (1-p)) = bo + b1*X+...

Once I get the values of b0 and b1, I can solve for p by:
p = [exp (b0 + b1X)] / [ 1 + exp (b0 + b1X)]

It is a good way or there is some other way to do it?

Thanks

#### fed1

##### TS Contributor
Yes this is fine, or logit link would be fine as well. You are modeling the chance that a dollar will be spent on A or B, so dummy variable is fine like in any other logistic regression model,

#### bs0409

##### New Member
Use beta regression for this problem............

It is a variation of logistic regression and is a GLM .........