# Tagged Questions

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### Statistical analysis approach for seed germination and viability study

Background: I am a stakeholder in a research project involving seed germination and viability tests for a number of shrub species. The ultimate goals of this project are to determine best practices ...
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### Using ordinal regression to evaluate predictor “importance”?

We've got a construct-likert-scale with an internal (8 items) and an external dimension (6 item) and there is also a 5-point item y assessing the "subjective" perception (How skilled do you think you ...
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### Optimal importance sampling with ratio estimator

This is probably a stupid question, but here goes: so we want to approximate the following expectation: $$\mathbb{E}[h(x)] = \int h(x)\pi(x) dx$$ Where $h(x)$ is an arbitrary function and $\pi(x)$ is ...
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### How to know which variables are more important in a process? [closed]

I have a process with 15 effective variables. I could record 9 variables to study its effect on process. I am looking for an appropriate factor to estimate the value of effectiveness of each factor. I ...
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### Variable importance from GLMNET

I am looking at using the lasso as a method for selecting features and fitting a predictive model with a binary target. Below is some code I was playing with to try out the method with regularized ...
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### Importance sampling in mixed, discrete/continuous variables

Consider the following model $$X \sim |\mathcal{N}(X;0,1)|$$ $$Y|X \sim Q(Y;X)$$ where I define $Q(Y=-x|X=x)$ with probability mass $\int_{-\infty}^{-x}\mathcal{N}(x;0,1)dx$, $Q(Y=+x|X=x)$ ...
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### Maximum number of independent variables that can be entered into a multiple regression equation

What is the limit to the number of independent variables one may enter in a multiple regression equation? I have 10 predictors that I would like to examine in terms of their relative contribution to ...
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### Measures of variable importance in random forests

I've been playing around with random forests for regression and am having difficulty working out exactly what the two measures of importance mean, and how they should be interpreted. The ...
(I am far from an expert in the field of statistics, so I apologize beforehand if my question is irrelevant or my use of any terms is incorrect) Let's suppose that we have a discrete variable $X$, ...