# All Questions

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### Modelling Changes in Number of Tesla Charging Stations over Years

I am analyzing a dataset about different cities (from 3 different EU countries) over different years. For each city in each year, there is information about the crime rate, GDP, literacy rate, total ...
12 views

### Finding the correct formula for a mixed-effects linear regression model

I have the following data: ...
11 views

### Confidence Intervals Overlaping Although Significant Effects in glmer in R

Below is the output of a glmer: ...
1 vote
18 views

### When and why is a likelihood ratio preferable to a difference as a test statistic?

We want to know whether two sample sets {x} and {y} were drawn from the same distribution. The null hypothesis $H_0$ is that they are. As statisticians we test the hypothesis by calculating the p-...
5 views

### How do I report sex differences in meta-analysis when some studies included only report data for one sex?

I am completing a meta-analysis of the sex differences in athlete ECGs. I have included studies that only talk about one sex to broaden the amount of data included. Is there a way to meta-analyse ...
9 views

### My total number of respondents are 61, but in frequency it is showing 89. all my frequencies shown are wrong now, please help [closed]

I ran the frequency tests at 1st, it was showing the right numbers (total 61). I had to recode one question, and after recoding it, the frequency for all the questions shows a total of 89, however, it ...
14 views

### What linear formula is this model fitting? [closed]

The rstatix R package has a wrapper around the aov called anova_test. It allows to pass ...
1 vote
7 views

### Time series model without ARMA component and with exogenous variables

I am trying to know what is the most simple model for time series data, with exogenous variables. What is the most simple framework I can use ? Is it possible to build a model more simple than ARIMAX, ...
32 views

### Does the matrix notation for OLS loss function assume that indexing a row from $X$ return a column or row vecotr?

I'm confused about the matrix notation of the loss function in ordinary least squares regression. In matrix form, the expression for a linear model is: $$\hat{y} = Xw$$ Where $\hat{y} \rightarrow$ ...
1 vote
6 views

### Custom contrasts in piecewise mixed effects models

I have longitudinal data from a two-group RCT in which the primary outcome was assessed at baseline, each week during the intervention, post-test and 5-month follow-up (6 times total). I am modeling ...
16 views

1 vote
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### How can I tell if a clutser-randomised crossover trial has made a unit of analysis error?

I am studying the following paper: https://jamanetwork.com/journals/jama/fullarticle/2698491 This is a cluster randomised control trial with crossover. I want to ensure they have not made a unit of ...
14 views

### Questionable results using powerCurve on nbinom2 glmer [closed]

I have a problem with a power analysis using powerCurve. The data show a drastic decrease over time, but powerCurve suggests that I would need data from over 100 sites, to be able to show this. I get ...
168 views

### Does it make sense to fit linear regression on single-case studies?

Just on principle, do you think it would make sense to make linear regression models for each individual in a study and treat replicates as data points? I don't mean reporting p-values or anything ...
29 views

### How to perform a 2 sample Kolmogorov-Smirnov test controlling for a type II error instead of type 1

I have four completely different sets of two samples and want to check for each set if both samples come from the same distribution, so four Kolmogorov-Smirnov tests total. If it's going to be ...
4 views

### How to calculate IoU metric if there is no mask

For example: YOLOv8 segmentation doesn't output any mask for concrete class if no masks was detected, but there is a mask for this class in the ground truth masks. I should set metric to zero for such ...
18 views

### Data analysis - ranking observation based on multiple parameters [closed]

I am currently looking for a method to rank my observation based on three numerical parameters. I would like to maximize two parameters and to minimize one in order to rank my observation. I have been ...