# All Questions

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### Removing NAs in logistic regression model [closed]

I have a data set that contains lots of NA values. If I use the na.action = na.omit argument, will this delete everything except row #2 (based on table below) OR does it result in retention of rows ...
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### How to solve this problem? [closed]

Given the two sample distributions in classes: Calculate arithmetic means and distinct (biased) sample variances and overall. Determine if there is stochastic dominance or not. I have the solution ...
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### Where is a good place to start with (hidden) state-space models?

I'm interested in (hidden) state-space models. My language here might be poorly articulated as I'm quite new to this area of math. The topic of Kalman filters has come "across my desk" a ...
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### Samples required for bounded accuracy in mean estimation error for multivariate gaussian

I'm working through some problems in a high dimensional probability textbook and don't seem to know where to start with this one. Any help would be appreciated! Assume $X_1, X_2, \ldots, X_m$ are i.i....
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### Correctly Interpreting Regression Coefficients For Financial Returns Data

I'm running some regressions on daily return data, and I want to make sure I'm interpreting the coefficients correctly. Right now X is a single column of values ...
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### Do Statistical Models (Automatically) Allow For "Ranking" Predictions?

I have always had the following question: Do statistical models (e.g. regression models, decision trees, random forest, etc.) automatically allow for ranking the predictions? I.e. If a random forest (...
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### Combining variables and PCs to find clusters

I am working on a 100 variables dataset, and I am following a recipe for calculating clusters: Select only variables that have less correlation, or are below a 10 value in VIF Then for the unselected ...
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### Implication of independence and conditional independence

Prove that if A and B are independent and conditionally independent given C, then A is independent of C or B is independent of C. How do I do this?