12 questions linked to/from Model Selection: Logistic Regression
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### Criteria for choosing the most appropriate logistic regression model [duplicate]

I've fitted 16 logistic regression models to my data and I'm not sure as to which model to choose as my final model. I looked at a couple of things to help me choose my final model. 1) significance of ...
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### Model selection in binary logistic regression [duplicate]

I have 3 possible "final" models in binary logistic regression (N=176, Number of events = 36). Now I am trying to decide which one to select. It´s clear,"All models are wrong, but some are useful", ...
100 views

### Logistic Regression - Model Selection Method [duplicate]

What is the best way to know the best selection method for our logistic regression model ? Forward Selection Backward Elimination Step-wise Selection Full Model. I am running logistic regression in ...
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### Why is variable selection necessary?

Common data-based variable selection procedures (for example, forward, backward, stepwise, all subsets) tend to yield models with undesirable properties, including: Coefficients biased away from zero....
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### How to identify suitable variables to assess confounding, mediation and effect modification?

Imagine that you are planning a study about risk behaviours among HIV positive injecting drug users. All the individuals included in the sample are injecting drugs and all are HIV positive. The main “...
662 views

### What happens if the full model has the smallest AIC?

Suppose I am modelling a binary outcome $y$ with $n$ covariates. If this model has the lowest AIC among all the other ones...would this be the one to use? Also in dealing with categorical variables, ...
952 views

### Logistic regression and odds ratio

If the odds ratio is greater than one with an insignificant p value for a variable in logistic regression should the variable be kept in the model? Can I select the variable with odds close to 1? ...
1k views

### How to quantify the significance of the difference between two z-scores? [duplicate]

I have one sample and several features. I calculate a z-score for various features, and for various combinations of features. Is there a way to quantify the significance of the difference between ...
662 views

### Effect of Wald-test and collinearity on Logistic Regression model selection

A researcher is interested in how variables, such as GRE (continuous), GPA (continuous) and rank of the undergraduate institution (categorical), affect admission into graduate school. The response ...
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### Is it possible to run multiple logistic regression for small sample size?

I have collected data, there are 300 non-injury and only 17 injury. Four categorical variables are significant according to Chi-squire, then I used Multiple logistic regression for significant ...