# All Questions

173,792 questions
Filter by
Sorted by
Tagged with
3 views

### What does it mean that the two first layer in Deep Belief Network are uni-directional

I have tried to read several Hinton's papers about DBN, but still did not understand why in DBN the visible layer and hidden layer are uni-directional. They should transfer the weights to other layers,...
5 views

### Measuring frequency of change in time series data with inconsistent time intervals?

Context I'm tracking auction house prices for items in Guild Wars 2 in a database. They provide an API that allows me to get the item's current buy/sell offer quantities and prices at that moment. As ...
6 views

### ID3 and neural networks learning model

I'm trying to find out what is the learning model of ID3 and Neural Networks -is it global or local for each of them. For decision trees in general I found that they use global learning but for ID3 ...
5 views

### Table frequency [closed]

You have multiple options You need a frequency table with the percentage of only some options However all the variable name without any calculation should be displayed there
8 views

### How do I do univariate regressions on SAS and how do I read the output?

Good evening! Last minute panic here, any help will be greatly appreciated! I need to output some preliminary data like the with SAS. All my variables are categorical (1; 0), either depression or the ...
8 views

### Why is sparse categorical cross-entropy “sparse”?

This is just a conceptual question... It seems to me that what is called categorical cross-entropy should be called sparse because with the one hot encoding it creates a sparse matrix/tensor (whereas ...
8 views

### Lost in Bayes: constructing a learner/classifier with noisy training data/inputs to simulate experimental data

I'd like help with tackling this toy-problem inspired by an experimental design in the neuroscience literature, as an exercise in learning how to do this sort of thing, and as a way to investigate the ...
6 views

### Ridge Regression - Advice on Modeling Sales Data

I am looking to use ridge regression to predict end of quarter sales revenue. My features are sales pipeline and revenue booked quarter to date. As the quarter progresses sales pipeline will ...
4 views

### Use of sub-segment information to predict outcome

I am working with a problem in an 102C8 sample space, and a binary outcome variable. Accordingly, I have 102 binary indicator variables of which 8 are 1 and 94 are 0 in each record. I am interested ...
5 views

### Poisson, Negative Binomial, and zero-inflated Poisson and Negative Binomial within a multilevel modeling context

I’m analyzing count data (e.g., number of students with suspensions), and the outcomes also have many 0s. The data are also nested (schools within districts). I’m familiar with using Poisson and ...
7 views

### Monotonicity condition for change of variable of a PDF in vector space

In the book pattern recognition and machine learning (formula 1.27), it gives $$p_y(y)=p_x(x) \left | \frac{d x}{d y} \right |=p_x(g(y)) | g'(y) |$$ where $x=g(y)$, $p_x(x)$ is the pdf that ...
6 views

### Adam optimizer in sPacy giving strange results

I have the following toy example to play with the TextCategorizer CNN model in sPacy. Given the distribution of my input dataset, I am expecting the test results to ...
25 views

### Why do we need Gumbel distribution?

I check the Gumbel distribution article on Wikipedia, it says it is useful to represent the distribution of maxima. But it is not easy to understand how it works? A detailed explanation or examples ...
10 views

11 views

### Using random effects for a between-subjects variable to assess variability in a mixed model

I want to use a mixed model to test random effects for between subject factors. Similar questions have been covered before, with answers that it can be done using lme4. (See here and here for some ...
3 views

### Comparing Risk of Estimators with unknown parameter

I would like to compare the risk of 2 estimators. Let $X_1,..,X_n$ are $\mathcal{N}(\theta,1)$. I have to show that the average $\frac{1}{n}\sum X_i$ is not admissible if we have prior knowledge that \$...