# All Questions

135,194 questions
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### In marketing experiment, can we determine the effect customer state has on response?

We have the goal of determining whether an email campaign has an impact on the amount of product that customers purchase. We have customers from several states but much more from some states than ...
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### what is the simplest algorithm of trial and error strategy? [on hold]

I want to implement a simple trial and error algorithm to control an event by chechking after every operation if a set of input parameters change or not. I know that Reinforcement learning ...
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### Likelihood modification in Metropolis Hastings ratio for transformed parameter

I want to use MH to get samples from $p(\theta \mid y) \approx p(y \mid \theta) p(\theta)$. Let's assume $\theta$ is heavily constrained and I transform $\theta$ to $f(\theta)$ so I can sample from ...
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### Dealing with a binomial outcome, is it correct to apply Mixed Logistic Regression in order to analyze plant's seed viability?

I've been reading several questions asked in this website but I couldn't quite find the answer that I'm looking for. It seems that my experimental design it's not that typical. It goes like this: I ...
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### Binary dependent variable sem [on hold]

I need to test a framework and I was planing to apply SEM. My dependent variable is binary, as most of the explanatory (some are also categorical, and few continuous). Witch package/tool do you ...
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### Calculate incidence rate per person or in total

For my study I am doubting about the following: First I want to present the incidence rate for patients who received an CT-scan. I thought I would just count all the CT-scans that took place and ...
22 views

### Do mismatches in areas of peak density affect the KS-test more than mismatches in low-density areas?

In the following plot you see my empirical data (black) plotted against a hypothesised distribution (blue). However, a KS-test shows that there is no indication that my sample follows this ...
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### KL divergence between sample and true (multivariate normal) distribution

I was wondering, whether there is a possible interpretation of the KL-Divergence between sample and true distribution in terms of probabilities. E.g. given $P=\mathcal{N}\left(\mu,\Sigma\right)$ and \$...
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### Multi-target Regression Neural Network: Trade Off

Suppose you have a number of input features, for example: x1 - temperature x2 - day of the week x3 - quantity of rainfall ... You are trying to predict a number of output targets - using neural ...
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### Calculate number of points with expected values

The Problem Lets say you have a game where using an item gives you a certain number of points, with different probabilities for each point value. The probabilities are unknown, but can be estimated ...
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### Understanding the MC dropout (Monte Carlo estimate)

I've recently came across the term "MC dropout" in one of the papers I was reading. In Neural Networks, when using a standard dropout layer on top of one of the model's layers, during training the ...
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### Marketing Promotion modelling, effects of a competitor's promotions

I am modelling the impact of a manufacturer's promotions onto it's sales using a regression model. Furthermore, I intend to include the effects of competitor A's promotions onto the manufacturer's ...
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### Power analysis for t-test instead of ANOVA

Let's say I have an experiment with a 2x2 repeated-measures design. Let's call the four cells A1B1, A1B2, A2B1, A2B2, for the factors A and B, each with two conditions, labeled 1 and 2. I want to ...
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### Confused: The data length of covariations in a nonstationary GEV

I have established a non-stationary GEV model and expressed the location parameter μ(x) as a function of two covariates (x1, x2) to reflect changing conditions, while the scale and shape parameters ...
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### Marketing Funnel Percentage Calculations

I implement a marketing funnel in python and I have an issue around the topic that I can't solve neither in statistical level. Lets say that we have the funnel A which contains ...
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### Feeding Embedding Vectors With Time Series Data to LSTM [on hold]

I have daily sale data of some retail products on a three year span and I want to build a model that can predict future sales for all of these products. While looking for a way to forecast multiple ...
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### R: Ordering data in a cell of data frame [on hold]

I have huge data frame of multiple columns, one of the column contain data like that ...
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### Would an “importance Gibbs” sampling method work?

I suspect this is a fairly unusual and exploratory question, so please bear with me. I am wondering if one could apply the idea of importance sampling to Gibbs sampling. Here's what I mean: in Gibbs ...
20 views

### Word Embedding for Sentiment Analysis

I am working on sentiment analysis of text. I am using keras word embedding. If my embedding has a vocabulary of 50 and an input length of 4 and I choose an embedding space of 8 dimensions, how will ...