# All Questions

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### Proportion test for subsamples?

I am trying to compare the outcome of two diagnostic tests performed on the same samples. I ran all of my samples once (n=400) and then ran a subset of the 400 a second time (n=85). We are looking for ...
1 vote
8 views

### Discrepancy of a sample on Latin Hypercube Sampling

I'm currently working on Design of Experiments (DoE) in order to obtain data to, later on, make some FEM simulations. The starting point is: we want to make those simulations (that depends on some ...
2 views

### Goodness of Fit for Comparing Multiple Fractional Logit Models

I'd like to use employ a fractional logit model where my dependent variable is bounded between 0 and 1 and I have two independent variables. For this type of model, I'm unsure, and hoping to get some ...
2 views

### multivariate time series forecasting

I have a dataset of 200,000 rows. Each row contains the song ID, the number of streams today (day_0), the number of streams yesterday (day_1), etc. up to the number of streams 21 days ago (day_21). My ...
1 vote
67 views

### What are some algorithms that are immune to class imbalance, and what makes them so? [duplicate]

This question is closely similar, however, the answer only speaks about Logistic Regression being one example. I am interested in knowing if there are more algorithms that are not affected (at least ...
1 vote
17 views

### Background on notation for generative models

In many papers on generative modeling and Bayesian inference in statistics, I come across the following kind of notation, in particular for hierarchical models. For variables $x_1, \dots, x_n$, it ...
1 vote
48 views

### How to pick a good training set?

From what I understand, my training set should represent the underlying distribution of objects, but what if my local view is not such a good representation? For instance I am working on a cell (i.e ...
1 vote
169 views

### How to use boolean features to classify, penalising number of features

I have a set of boolean features (n=~2k) to predict a categorical outcome. I have been using decision trees via sklearn successfully. However, for unseen data, there is a cost to assay each feature, ...
1 vote
13 views

### Classification rule

In classification, is there any difference between MAP (maximum a posteriori) rule, minimum misclassification rule, and the Bayes decision rule. As far as I know, all of the three rules seem to ...
11 views
+50

18 views

### What is this bias called?

People often transfer money from their savings to their checking account when their checking balance drops below a certain amount, for example, 1000 dollars. Let's say you plot the checking account ...
911 views

### How do I measure the variability in time time-series power consumption patterns?

Figure 1: X-axis represents the time (0-23 hours) and Y-axis represents the electricity consumption in kWh. I am working with time-series power consumption data. Figure 1 shows the shapes of one user ...
4 views

### Meaning of asymptotic in the context of stochastic process

So for a fractional Brownian motion, I define $k^{th}$ variation as $$S_n = \frac{1}{n}\sum_{i = 1}^{n}{|B_{H}(i\times\frac{T}{n}) - B_{H}((i - 1)\times\frac{T}{n})|^k}$$ where T is fixed and $B_H$ ...
18 views

### Does it make sense to include both age and birth year as covariates in a model?

A researcher asked me about adjusting for both age and birth year in a model. To my mind these are perfectly collinear, but then it got me started looking around online and down the rabbit hole of age-...
562 views

### How can I get the cumulant expression from the recursive relation between cumulant and moment?

I am reading some paper about high-order statistics https://link.springer.com/article/10.1007%2Fs11004-009-9258-9?LI=true. The paper gives two recursive expressions relating the multivariate cumulants ...
5 views

### How do I identify participants that are causing low internal consistency?

I have a low cronbach's alpha for one my study's measures (around .6). Half of the measure is reverse coded, and these reverse coded items are the ones that were flagged with having low correlation ...
7 views

### Implications of using a caliper when matching: Would it ruin ATE claim?

I've started to learn about matching methods using MatchIt package, and read "Choosing the causal estimand for propensity score analysis of observational studies" (Greifer & Stuart, 2021)...
4 views

### R – Model specification for TWO TIME variables AND PAIRED design in repeated measures generalised linear mixed model (GLMM) (in lme4 package)?

This question has already been suggested to be reposted here from stackoverflow. I have a dataset similar to below: Fixed effects of interest Hour (4-level factor) Response (continuous) Treatment (2-...
1 vote
12 views

### Bias adjustment in a transformation - adjustment before and after transforming

Suppose $X\sim(\mu, \sigma^2)$ (I'm happy to also assume normality), and let $Y = h(X)$ where $h$ is at least twice continuously differentiable. I want an approximation of $E(Y) = E[h(X)]$. One ...
5 views

### How do I retrieve the testing and training logloss from a last_fit XGBoost model using tidymodels?

I'm trying to make a plot using the evaluation logs from model training and testing for my XGBoost model (using r) but I can only plot the training evaluation log after performing last_fit (fit to ...
1 vote
20 views

### Choosing correct statistical tests

I need to come up with the fitting statistical tests for my university and don't know exactly how to approach this problem. Following scenario: In theory entrepreneurs can be divided into 2 groups: ...
183 views

1 vote
255 views

### how to test for moderation effects comparing two regression models?

I collected data about consumers website usage behavior and reaction to online advertising for mobile and desktop devices. My goal is to analyze how consumers website usage in reaction to online ...
34 views

### papers on graduate statistics [closed]

Edited for clarity and details, according to the site. I have some statistics on graduate students (time to finish, number of advisors, and time for them to become researchers). This is in excel ...
540 views

### Interpretation of scaled error measures

can someone give me an explanation on how one would interpret the result of a scaled error measure. For example the Mean Absolute Scaled Measure (MASE). The numerator is the mean absolute error and ...
34 views

### What does this notation mean: $$\mathcal{N}(0, 7^{3/2} (-\Delta + 49 \mathcal{I})^{-2.5})?$$

Found it in Appendix A3.3 (and A3.2) of this paper: Fourier Neural Operator for Parametric Partial Differential Equations I understand the basic notation of the normal distribution, but this notation ...
1 vote
12 views
+100

### NER With Custom Tags, How to Approach

I am building a "field tagger" for documents. Basically, a document, in my case something like a proposal or sales quote, would have a bunch of entities scattered throughout it, and we want ...
1 vote
137 views

### Does it make sense to compare on a dummy model?

Say someone were to construct a binary classifier A on some variables. They want to determine whether those variables help with prediction or not. So they build a second binary classifier which ...
1 vote
100 views

### Splitting Data Into Training and Test set [closed]

I am trying to split a data set into training and test set with these codes ...
38 views

### Ideas to identify cutoff points for tumor classification?

My lab models breast cancer in mice. I am using a 36-gene signature (derived from one of our mouse models). In the signature, all genes are elevated. I have 997 human samples and would like to apply ...
1 vote
26 views

### Measure for classification where model predicts a class with a given confidence

I currently have a model which predicts one of four classes and gives a confidence with its output. How can I score my model taking into account the confidence the model should be penalized if a ...
42 views

### What statistical test can I use? If any?

I'm currently investigating mortality rates in my local area compared to England. Mortality rates in my local area have always been higher than England however recently I've noticed a widening gap ...
240 views

### Fitting an ARIMA subset model in R

Suppose I have a time series. After looking at the PACF plot, it largely decreases to zero after 3 lags, but there is also a PACF value that "pokes out" of the significant bounds at a far ...
49 views