# All Questions

137,586 questions
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### multcomp() vs emmeans() for multiple comparisons

I have two sets of models. The first set contains a number of logistic models, fitted using glm(), with different binary dependent variables. The second set ...
1answer
7 views

### How to compare different clusterings of the same data

If I have two groups of clusters of the same data (e.g. that were created using different modalities), what's a standard/established way of discovering interdependencies/relationships between the two ...
1answer
8 views

### Dataset documentation and schemas

When working with databases one typically specifies a schema, describing the data at least on a very coarse level. Often, one does not use a database, but loads the data in memory, into e.g. a pandas ...
1answer
18 views

### How to allocate unclassified observations proportionally within classified data?

In my dataset, about 30 percent of all observations belong to a unclassified category. Since I want to account for the effect of these observations, I want to allocate these unclassified observations ...
0answers
6 views

### how the natural policy gradient simplifies?

in David Silver RL course page 37 for "natural policy gradient" Using compatible function approximation we have: So the natural policy gradient simplifies: my question is how the above equation ...
0answers
31 views

### Looking to identify a book by a top statistician with a chapter on Simpson's Paradox

It was more than 20 years ago. I had just gotten acquainted with Simpson's paradox. I was browsing in a bookstore and saw a book by an eminent statistician -- eminent in the sense that I had come ...
0answers
12 views

### Coding Random Forrest in R

I'm looking to code a random forest in R but am having a bit of trouble in my dataset. Before I get into the problem, let me reproduce my code below. The response variable of interest is '...
1answer
22 views

### How to find the “variance” when using “central limit theorem” on a Poisson distribution?

Assume we have N number of inventors. All inventors work at a company. Each inventor expects to invent X number of inventions per year. How many inventions they invent per year has a "Poisson ...
0answers
3 views

### How to interpret LDA (Latent Dirichlet Allocation)?

Say I want to run topic modeling with LDA on The 20 newsgroups text dataset. So basically a dataset with texts where every text belongs to one of 20 categories. I want the LDA to split the documents ...
1answer
39 views

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### Correlations and Hierachical Regression

For my dissertation I've carried out a hierarchical regression. My results have shown: -correlations. Neuroticism is correlated non significantly .000 on SPSS to my dependent variable. Mood is non ...
0answers
5 views

### Fuzzy Regression Discontinuity and Instrumental Variables

What is the logic behind using an IV for a fuzzy RD?
0answers
21 views

### Find UMVUE of $p^3$

Let $X_1, X_2, ..., X_n$ be a random sample from $Binom(1, p)$. I'm trying to find the UMVUE of $p^3$. Some thoughts: Apparently, $\bar{X}^3$ is not the answer, although it's the MLE of $p^3$. For ...
0answers
11 views

### Aligning and clustering sequences of events

I have some data describing sequences of events. There are a number of different events (over 30), and the data records which event occurred in what order. There are no fixed number of events that ...
1answer
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### I ran an ANN model and got an extremely low R2 but a pretty good MSE, what does this mean?

I ran an artificial neuron network on data with about 2,000 rows and 3 features. I got a R2 of .06 which is really low, but a good MSE of .41. Why are these performance evaluators of this model ...
0answers
19 views

### Understanding backprop equations

I was watching a video on backprop from deeplearning.ai where one particular thing confused me a lot. In the backprop, as shown below, Why aren't we averaging <...
0answers
5 views

### Bayes vs trial factor (particle physics)

In the statistical inference for particle physics is the trial factor analogous to Bayes factor but for the frequentist analysis?
2answers
28 views

### why did the subset and factor influenced coefficients of logistic regression in R

The coefficients changed a lot when I used all the factor levels versus when I limited to only one level of a factor as a subset of the data. I am trying to do a logistic regression between the ...
0answers
4 views

### Approximate Bayesian Computation: Applications to Elevator Group Control Systems

I am working on a project where I will be using Approximate Bayesian Computation (Likelihood-Free Inference) in order to improve an Elevator Group Control System, e.g. minimize the waiting time of the ...
0answers
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### Difference between Granger causality and Instantaneous causality?

What is the difference in terms of inference? Does Instantaneous captures the short term cause and effects?
0answers
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### Score test for multiple parameter model

Suppose I have a multivariate linear model: $y = Z\bar{\alpha} + x\beta + \epsilon$ Where $Z$ is a matrix of covariates and $\bar{\alpha}$ are their effects. I refer to them as covariates as I am ...
4answers
215 views

### Understanding p-Values using an example

I know there might already be tons of questions around understanding the interpretation of p-Values, however I would ask the question in a very limited form and with the use of a specific example ...
0answers
5 views

### Appropriate analysis for univariate proportion data and environmental variables

I'm new to statistics so am trying to choose the best analysis to find if; There is a difference between canopy cover (0-100%) at different sites There is a relationship between canopy cover and ...
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6 views

### Control for two variables in repeated measure ANOVA

I have a 2 factors repeated measure ANOVA for measuring Response Time to stimuli in two different contexts with two different stimulus types. The context and is not supposed to have any main effect. ...
0answers
23 views

### How to interpret the Z Value in probit regression summary

I am running a Probit model in R and find trouble interpreting the Z Value of -9.974. Obviously, it is not the same as the Z-score. So how do I interpret it and is t the same as the t-statistic on my ...
0answers
11 views

### Friedman and Kruskal

I have a data with 4 groups and multiple variables with measured values. my groups are ES, EP, PP and PS. ES and EP are associated and PP and PS are too. So i would like to compare my groups in non ...
1answer
36 views

### On a mistake computing the Kullback Liebler Information Criterion

THE FRAMEWORK: Let $X_1$ be an observation from a normal random variable with mean zero and variance $\sigma^2$ and lets call the PDF $f(x)$. I want to minimize the Kullback Liebler Information ...
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8 views

### Effect size for linear models

I´m running simple linear models in R y~x but always got a really small R², although the p-Value always shows significance!. Now I wanted to calculate an effect size because I want to know whether ...
0answers
18 views

### Comparing the First Names in two population samples

I'm not great at stats and hope for a bit of help ... I have two sets of peoples first and last names the first group has about 5000 unique first and last names and the second about 300. When I ...
1answer
25 views

### can you help me to do a difference of CDF?

I have 2 CDF's with equal number of points that I want to compare. These are from: Temperature of 1 month from 2012 Mean temperature across months What can I do to obtain this difference, this is ...
0answers
10 views

### Random effect VS Pooled OLS

I am a second year MSc ACFN student at Addis Ababa University, Ethiopia. Now, I am conducting my research on the "effect of leverage on profitability and I use a panel data". When I was trying to ...
0answers
16 views

### How do you define the error in a hidden layer of a neural network?

I am reading some introductory texts on neural networks. While I am able to understand that the error in the final layer of the neural network is but I am not able to understand how the errors in ...
0answers
5 views

### Why is the reward fluctuating for Double Q-Learning?

I am trying to implement Double Q-Learning using neural networks from the Keras library. When I first tried Simple DQN, the graph of the reward was fluctuating a lot so, I implemented a Double DQN. ...
0answers
10 views

### How do I put back the name of website together with the data scrapped? [on hold]

I have two columns "name" and "link" which indicates the name of the firm and the link to scrap from. How do I put back the name column so that each row of scrapped data will have a column with the ...
3answers
43 views

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### Proof for multicollinearity consequence

I came across this statment "Even extreme multicollinearity (so long as it is not perfect) does not violate OLS assumptions. OLS estimates are still unbiased and BLUE (Best Linear Unbiased Estimators)"...
0answers
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### How can I use repeated cross-validation to report out-of-sample prediction performance?

I'd like to better understand how to report the out-of-sample prediction performance using repeated k-folds cross-validation. I think I have a reasonably good understanding of the motivation for ...

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