Linked Questions

3 votes
2 answers

Logistic Regression -- Use of real values between 0 and 1[as opposed to two classes as negative:0 and positive:1] [duplicate]

I just wanted to confirm if this was correct :) For logistic regressions, do the outputs in the training set are actually no different than the outputs that we get as predictions? Is the only reason ...
2 votes
1 answer

Predicting values in a given range [0, 1] (not probability) [duplicate]

I need to predict the impact of a set of node failures in a network, based on 2 features: the fraction of failed nodes and a measure of their network centrality. Failure of less important nodes will ...
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0 votes
0 answers

Which regression model to use for a probability as dependent variable? [duplicate]

My dependent variable is a probability. As such, values lie between 0 and 1. The most common values are 0, 0.5, and 1 each occurring in 20% to 30% of the observations but any value in between is ...
  • 305
0 votes
0 answers

How to build a model with a continuous response variable bounded from 0 to 1? [duplicate]

How to build a regression model with a continuous response variable bounded from 0 to 1? I think it is not logistic regression, where I am not predicting a binary response variable, Right? Sorry ...
  • 33.9k
1 vote
0 answers

Method to predict outcome as percentage of two categories? [duplicate]

In real world example I have elemental composition data for groundwater, which is known to be coming from two sources. I have control data where all predictors are from source A and data where all ...
  • 11
69 votes
5 answers

How small a quantity should be added to x to avoid taking the log of zero?

I have analysed my data as they are. Now I want to look at my analyses after taking the log of all variables. Many variables contain many zeros. Therefore I add a small quantity to avoid taking the ...
  • 3,464
35 votes
3 answers

How to do logistic regression in R when outcome is fractional (a ratio of two counts)?

I'm reviewing a paper which has the following biological experiment. A device is used to expose cells to varying amounts of fluid shear stress. As greater shear stress is applied to the cells, more of ...
  • 1,575
36 votes
3 answers

Why Beta/Dirichlet Regression are not considered Generalized Linear Models?

The premise is this quote from vignette of R package betareg1. Further-more, the model shares some properties (such as linear predictor, link function, ...
  • 16.1k
21 votes
3 answers

What is the relationship between the Beta distribution and the logistic regression model?

My question is: What is the mathematical relationship between the Beta distribution and the coefficients of the logistic regression model? To illustrate: the logistic (sigmoid) function is given by $...
  • 5,994
14 votes
3 answers

What are the issues with using percentage outcome in linear regression?

I have a study where many outcomes are represented like percentages and I'm using multiple linear regressions to asses the effect of some categorical variables on these outcomes. I was wondering, ...
  • 2,343
21 votes
1 answer

How to fit a mixed model with response variable between 0 and 1?

I am trying to use lme4::glmer() to fit a binomial generalized mixed model (GLMM) with dependent variable that is not binary, but a continuous variable between zero ...
  • 96.4k
22 votes
2 answers

Why exactly can't beta regression deal with 0s and 1s in the response variable?

Beta regression (i.e. GLM with beta distribution and usually the logit link function) is often recommended to deal with response aka dependent variable taking values between 0 and 1, such as fractions,...
  • 96.4k
12 votes
4 answers

Extending logistic regression for outcomes in the range between 0 and 1

I have a regression problem where the outcomes are not strictly 0, 1 but rather in the range of all real numbers from 0 to 1 included $Y = [ 0, 0.12, 0.31, ..., 1 ]$. This problem has already been ...
6 votes
2 answers

Percentage as dependent variable in multiple linear regression

Although I saw a few similar threads, I don't believe I saw the specific answer to the following question: For simple linear or multiple linear regression, if your dependent variable is a percentage, ...
  • 61
10 votes
2 answers

Is it technically "valid" to fit a logistic regression with a dependent variable that is a proportion?

Several posts (here and here) suggest that beta regression is more appropriate when the dependent variable is naturally bounded between 0 and 1. My question is, leaving appropriateness aside, is it ...
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