# All Questions

140,433 questions
32 views

### Guessing the gender of someone submitting a multiple choice questionnaire

If I have 100 people fill out a multiple choice questionnaire (containing 10 questions with 5 answer choices for each question) and the respondent writes their gender on their questionnaire, what is ...
11 views

### Ranking users by mean daily message count and least variation

I would like to rank users of a text and voice communication app by the number of messages sent, the amount of time spent on voice calls and number of interactions. This ranking should be updated in ...
6 views

### Data augmentation for animal measurements

I am looking for methods to do data augmentation for an animal study. What I want to do is generate a large number of data points by using a min and max measurements of the animal. So I have 2 ...
7 views

### Hyperparameter-free method for Moving Average/ Exponential smoothing?

I want to find hyperparameter-free method for Moving Average/ Exponential smoothing. Is there any related paper or python code? S(t)= alpha * F(t) + (1-alpha) * S(t-1) Any methods can avoid the ...
12 views

### Changing a conditional probability to a deterministic function [on hold]

Suppose that we have a conditional density function $p(y|x;\theta^*)$, where $\theta^*$ represents distribution parameters and are assumed to be deterministic. Is it possible that we write this ...
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### What Would Be The Best Scikit Learn Alogriths For Lottery Numbers? [on hold]

I want to start a machine learning model on lottery results using ScikitLearn. Below is the head of my database. If anyone has any suggestions I would appreciate it. Thanks. Head of Database: ...
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### Adjusting normally distributed values for another variable [on hold]

Suppose I have this data set: ...
9 views

### Estimating yearly diagnosis rate from multiple studies

I want to estimate yearly diagnosis rates from some 8 studies. Each of the 8 studies contains the following data: $n$ = total number of patients (e.g., 100) $t_{start}$ = start timestamp of the ...
15 views

### trend stationary with external regressors

Suppose I have two trend - stationary time series with strong correlation. In the case where there are no regressors, if a time series is trend-stationary, it becomes stationary by subtracting a ...
8 views

### Role of different exponential families in generalized linear models

I've gone through a variety of introductions to generalized linear models (GLM), and there's always a point in the discussion that confuses me. The story always begins saying that $P(y|x)$ belongs to ...
8 views

### a covariate versus a random effect [duplicate]

I have looked around on cross validated as well as other places but can't seem to find an answer. I'm running a generalized linear mixed-effects model. Y~initial abundance + Treatment + (1|Month) ...
7 views

### Comparing Gaussian and Poisson GLM when applied to count data; “Chi-Squared Error”

I have a fixed set of predictors ($[x_1,x_2,...,x_p]$), which I'm using to fit a GLM for univariate responses ($y_1$, $y_2$,...) of various types. E.g. I fit a GLM for $y_1 \sim [x_1,x_2,\dots,x_p]$, ...
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### Using groupwise averages of dependent variable as predictors

Let's say I have a binary classification problem with a number of categorical predictors. Is there an issue with creating new features by calculating the group wise average of one or more of the ...
20 views

### Repeated Measures in Mixed Model - Creating Graphics

In learning about mixed modeling and how to perform this in SAS I came across this article https://stats.idre.ucla.edu/sas/seminars/sas-repeatedmeasures/ However, I am not able to wrap my head ...
36 views

### Power calculation for two-sample Welch's t test

The R function power.t.test does power calculations (outputs power, sample size, effect size, or whichever parameter you leave out) for t-tests, but only has a ...
32 views

### What test do I use to check if two samples came from different population?

I'm aware that t-test checks if two sample data sets have the same difference in means with confidence. But testing difference in means is not equivalent to testing if the two distributions came from ...
10 views

### Conditional probability of n sequential time series points

I have hourly road traffic volume data. While I assume the volume data can be defined as normally distributed, there is some correlation. i.e. The traffic in the past hour may affect the traffic in ...
7 views

### Elastic net/LASSO with soft labels

Sometimes you do not have firm Y/N labels, but e.g. 80% probability of Y as a label. E.g. this happens, if you train a model on a small amount of labelled data, predict for a large amount of ...
13 views

### C5.0 - How to interpret a Tree of size 1?

I am using C5.0 to try to predict an output. The code is rather simple : ...
10 views

### What transformations can I use for time series with negative values?

Currently, I am working with different time series. Some of the series that I have can have all negative values or positive and negative values. When I have a time series with all positive values I ...
8 views

### How to get one composite score to represent a MIMIC factor (including both formative variables and reflective indicators)

I have a MIMIC model where the latent variable of interest has both formative causes and reflective indicators (as depicted in the figure). My question is: is there a way to get one composite score ...