# All Questions

140,274 questions
4 views

### How to read a multinomial logistic regression output in R

I have already tried google and Youtube but I am still slightly confused on how to read the output. It's difficult to read the output because there are no stars and it's not in a simplified format ...
2 views

### Models for ranking possible classifications by confidence

What are good means of finding the various highest confidences or likelihoods for the hundred possible outcomes of a classification problem? Inputs belong to only one class, unlike document ranking, ...
4 views

### Is there a keyword recognition system without learning the Phoneme

As I understand in speech processing and machine learning area "keyword recognition" (also termed as keyword spotting) is a important part. In "keyword recognition" sytem it is desired to learn a ...
3 views

### Multiple Imputation with categorical variable for treatment: Do I have to impute stratified by treatment?

I want to impute data for a clinical trial with four treatments and analyze the data to determine if there is a treatment effect. Normally I would perform the imputation stratified by treatment so ...
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### How to deal with training data after cross validation?

I have imbalanced data and used undersampling to construct several logistic regression models, using the way very similar to EasyEnsemble. The parameters, like regularization, number of models were ...
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### About estimators and Bernoulli distribution

I have this homework question which I'm not understanding. It goes as follows: Let $X_1,\dots, X_n$ be a random sample with Bernoulli distribution of parameter $p$ and let $T_n = \sum_{i=1}^n X_i$. ...
11 views

### Marginalizing statistical test results in a two-factor grid

Consider the following toy problem. Suppose that we have several food groups: meat, vegetables, fruit, etc. For any given pair of food types A and B, we ask whether people that eat both A AND B have a ...
9 views

### Variance of a Double Series [on hold]

Why does \begin{align} var\bigg(\frac{1}{br}\sum_j^b\sum_k^r{\beta_j}\bigg) &\neq \frac{1}{b^2r^2}\sum_j^b\sum_k^r{var(\beta_j)}\\ \frac{1}{b}\sigma^2_\beta &\neq \frac{1}{br}\sigma^2_\beta \...
22 views

### How to form groups before randomizing the treatment assignment?

Consider the following example. You want to assess the effect of a new class program on educational outcomes relative to the old program. You have recruited $N$ subjects for a randomized control trial ...
12 views

### Meaning of Graph from tensorBoard

Can someone please help me to interpret the graph from tensorBoard. I have attached the screenshot herewith.
7 views

### Reporting difference in distributions for text

I am working on a problem that can be translated to determining which of two corpora generated a given sample text. I have a hypothesis for before some processing and other for after processing, and ...
16 views

### Residual Analysis

I have just reproduced an example regarding a regression model for fibre strength data. The data consisted of tensile strengths of silicon carbide fibre at four different lengths. From the data, a ...
12 views

### Is chi squared test of independence correct with control group?

I'm analyzing some data from an experiment in which passage of time between conflicting tasks is my independent variable and one of my dependent variables is a dichotomous one ("A","B"). I also have a ...
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### Correction for multiple testing of permutation p-values

I simultaneously performed multiple statistical tests on my samples under investigation. For each test i obtained p-value that i had to correct for ...
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21 views

### Why does first differencing correct autocorrelation?

If we have an autocorrelated variable in the multiple regression model, why does taking first difference help?
8 views

### Sample size prediction in multivariate A-B testing

I need to run an A-B testing with one control group (40%) and 3 variants (20%) each. Base line = 0.65 Target lift = 0.25 Power =0.8 Confidence = 95% I found following R code to find minimum ...
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### Reporting the mean±StD from different-sized samples in the same barplot

I am analyzing a temperature image using a land cover map with the overall goal to prepare a barplot where I report the mean ± StDev temperature for each land cover class. To do so I assigned each ...
6 views

### How to use SPSS to run 4 rows by 3 columns of data for Chi-squared [on hold]

How can I input and run 4 rows by 3 columns of independent data for Chi-squared using SPSS with the following example
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### Cross Validation Score difference between test/train individual r-square

I am new to Machine Learning, as part of my learning, I created a Linear Regression Model using two attributes for Boston Housing Price dataset. I am having doubts calculating : MSE and R-Square. So, ...
24 views

### Calculating standard errors of non-OLS regressions in python and scipy

Scipy provides the ability to get a number of metrics from the output of an OLS regression model, a few examples of which are the following: ...
22 views

### What is the relationship between: the first raw moment, location, expected value, mean in general, arithmetic mean for any sensible distribution?

I am a bit confused by the several sources telling that: the first raw moment is by definition the arithmetic mean expected value of any random variable is exactly the arithmetic mean The expected ...
6 views

### Interpreting Durbin–Wu–Hausman test with large sample size

I'm trying to determine whether to use random-effects or fixed-effects. The Durbin–Wu–Hausman is significant which suggests that fixed-effects are more appropriate. However, looking at the details, ...
6 views

### Can I use Free Energy as reconstruction error when I use RBM to anomaly detection?

Can I use Free Energy as reconstruction error when I use RBM to anomaly detection? If Free Energy of a sample more a threshold, can I regard it an outlier? How to explain Free Energy of RBM?
58 views

### Identifying a distribution

I am trying to understand what sort of distribution is produced by the following code. Using the following Matlab code we can generate a distribution (normalized such that the sum of the set is equal ...
80 views

### When to remove insignificant variables?

I'm working on logistic regression model. I checked the summary of the model which is built on 5 independent variables out which one is not significant with a P-value of 0.74.I wish to know that do we ...
17 views

### Convert R's rgamma random sampling to Python scipy's gamma.rvs

Is there a way to translate from R's rgamma(MSamples, shape = kA, scale = thetaA) gamma random distribution, to Python scipy's ...