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Questions tagged [paired-data]

Paired data arise when an experimental or observational study design deliberately samples two units as a dyad to form a basis of comparison. Use this tag for any question about paired data or their analysis.

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Paired Non-parametric test with more than 3 groups but just two timepoints

I may not have found the right term to search for, so I am asking what might be a straightforward question: Assume we have an experiment with paired non-normal distributed data, called "Pre" ...
StrugglingStatisticEnthusiast's user avatar
1 vote
0 answers
26 views

Combining Data from Multiple Participants for Statistical Analysis of a Facial Expression Memory Task

Context of the Query: I am working on a project involving a memory task for facial expressions, consisting of two phases: Encoding Phase: In this phase, participants are exposed to 8 virtual ...
Clémentine Pouliot's user avatar
2 votes
0 answers
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What is the correct sample size for the purposes of this test?

$X_i$, $i = 1, \ldots, n_X$, are i.i.d. from some distribution; and $Y_j$, $j = 1, \ldots, n_Y$, are i.i.d. from some other distribution. Consider all pairs $(X_i, Y_j)$. The number of pairs is $n=n_X ...
Jessica's user avatar
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Bland-Altman plot for Heart rate measurements (bpm) follow certain 'line' patterns

I'm comparing heart rate measurements of different devices during different periods of activity (5 min resting, 5 min exercise and 5 min recovery). To analyse the agreement between devices, I want to ...
Famke's user avatar
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1 vote
2 answers
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Calculating variance between paired samples, where one sample is constrained to always be the lower bound?

I'm sure this is a solved question, but I haven't been able to hit on the right search terms. Suppose I have paired samples A and B. A represents a derived variable (say distance "as-the-crow-...
Danielle McCool's user avatar
8 votes
6 answers
564 views

Is it better to perform multiple paired t-test or One-Way ANOVA test

I have 7 patients with blood measurements from two different tissues and at two different oxygenation states. We first took measurements from tissue A and B (Normoxia) and then we administrated oxygen ...
user161260's user avatar
2 votes
2 answers
193 views

How to compare two PMF generating functions?

I have two functions $f$ and $g$ that map an input vector $x_i$ to a probability mass function. For example: $$ x_i = [0,1,2] \\\\ f(x_i) \rightarrow [0.1, 0.3, 0.2, 0.2, 0.2] \\\\ g(x_i) \...
ilija139's user avatar
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Ancova or other test?

I am struggling to select the correct type of test for my data and would like to eventually run it in R. The design is as follows: A treatment vs control group of plants From each plant the following ...
Allyssa Hinkle's user avatar
2 votes
1 answer
36 views

"paired" comparison of more than two algorithms

When comparing two algorithms $A$ and $B$ on test data $x_1,\ldots,x_n$ by means of a performance measure that yields $A(x_i)$ and $B(x_i)$, there are two standard methods: Check whether $\frac{1}{n}\...
cdalitz's user avatar
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2 votes
4 answers
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Sample size. Paired T-Test and repeatability

The study involves 10 subjects, in which we measure speed with 4 different shoes, and the measurements are repeated 4 times, and this is done on two different tracks, indoor and outdoor. On the one ...
mdscience's user avatar
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Is there an way to model random effects in a design that is typically analyzed by the McNemar test?

My question is: if in a study with paired binary response data (where McNemar test is often used) we can use the exact binomial test to test the odds ratio, is it possible to model the same odds ratio ...
jeffalltogether's user avatar
6 votes
1 answer
204 views

Can Wilcoxon be used in large sample with non-normal distribution?

I am doing my undergrad research, aiming to know the difference of before and after an intervention. our sample size is 37 which is already considered as a large sample right? However, when we test ...
Chilenesa's user avatar
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0 answers
25 views

How to compare the mean of different variables?

I am working on factors causing culture shock. I designed a questionnaire regarding 7 different factors which could be the cause of culture shock. I calculated the mean of each factor by averaging the ...
Rehan Qayyum's user avatar
0 votes
1 answer
18 views

AUC comparison with Delong when i.i.d is broken due to clustered data

I am asked to compare two AUC ROCs and output confidence interval for both. Delong method allows (and also Fast Delong) to have a stronger test than usual bootstrapping method. The data I am working ...
Tamsina Ludwig's user avatar
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47 views

When to use paired samples tests? Specific case in clinical research

I am working on the analysis of an observational clinical study. It is basically a control/intervention study, where the intervention group received a novel protocol. In order to assess its ...
LevG's user avatar
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1 answer
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Compairing two groups with paired data

I have two groups of samples: healthy and diseased groups. Each had an X treatment. So, I have a healthy baseline and healthy X treatment. The same for the disease group. Which is the best way to ...
Biologist09's user avatar
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0 answers
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Analysis of paired data with five levels - cochran's q analog

I am trying to analyze a paired dataset where each subject had a test performed different ways from the same sample. The test gives an answer that is five ordinal levels (Very High, High, Medium, Low,...
user918967's user avatar
1 vote
1 answer
33 views

Paired study designs for continuous data vs other types of data

My teacher says : We're going to consider something called a paired design. But for now, we'll only consider this when we're doing continuous outcomes. Sometimes you'll see this in the literature, ...
Happy Cretine's user avatar
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0 answers
10 views

Sensible neural network architecture for image stitching?

I am currently trying to design a neural network for image stitching, but I am having trouble coming up with a neural network architecture that seems suitable for the job. The input to my neural ...
Tue's user avatar
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0 answers
51 views

Using McNemar’s test to compare binary classifiers

I am evaluating multiple ML models which are performing the same binary classification task on the same dataset with the same train-val-test split. I am now looking to compare these models and since ...
SmollPangolin's user avatar
1 vote
1 answer
82 views

Paired t-test or ANCOVA or linear mixed model?

Recently I encountered a situation where each subject has a continuous response variable at 3 time points ($t_0$, $t_1$, $t_2$). There are $3$ treatment groups ($A,B,C$), and some covariates. Consider ...
Ronald Carlos's user avatar
2 votes
1 answer
38 views

Is it possible to test if the response difference over two time points is significantly different between groups when there are no repeated subjects?

I currently have a dataset where I've collected data between two groups (disease versus control). The experimental design is to evaluate how the response variable changes over time. Thus, we have 4 ...
Syuma's user avatar
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1 vote
3 answers
42 views

Wilcoxon Signed rank test for heavily tied paired data

We conducted an experiment to test the effect of a map annotated with the height of landscape features on participant's estimates of height relative to that recorded by a UAV. We asked them to record ...
Nicola 's user avatar
1 vote
0 answers
23 views

Paired, Two Sample or Repeated Measures Test

I'm trying to understand when to use a paired T-Test over a two sample T-Test. In most cases it's clear but I have the following hypothetical scenario. A social media company claim offer a feature to ...
tom dude's user avatar
1 vote
0 answers
28 views

Extending paired t-test to compare agreement between three or more analytical instruments over time

I have three instruments that measure the concentration of dust in the air, and I want to test whether the mean difference between their measurements is zero (i.e that they give the same measurement). ...
fieldofsheep's user avatar
0 votes
0 answers
36 views

Effective pairwise comparisons for group ranking?

Suppose I have a list of items(~3500 in number) and I want to do a group based ranking into 4-5 groups. I can get pairwise comparisons between the elements but I want to choose the items to compare in ...
something something's user avatar
5 votes
1 answer
44 views

Is repeated measures appropriate for testing for a difference in repeated paired group measurements?

I'm new to repeated measures and am trying to understand how it maps to lmer. I have measurements from two time periods: $t_1, t_2$. At each measurement period, the same 50 different foods are scored ...
Estimate the estimators's user avatar
0 votes
0 answers
22 views

Identifying the type of missing data and the post hoc test that can be carried out for Skillings Mack test

I have a non-normal paired sample dataset. Each row represents a dog that has been tested for an experiment. Each dog was provided with three cues (treatments): 5s cue (aka only face cue), vocalone (...
Rohan Sarkar's user avatar
1 vote
0 answers
29 views

Using independent samples t-test for paired data?

we have a 'problem' when analysing data. It's a psychological experiment where participants could choose the upcoming condition, let's call them A, B, C, D. We are interested in analysing whether we ...
Andre's user avatar
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2 votes
2 answers
206 views

Determination of sample size vs. repeated measurements in experimental design

NOTE: Revised question following suggestions from others. Thank you for taking the time to help me refine this question to make it answerable! Background I want to compare the performance of two ...
CBRF23's user avatar
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0 answers
20 views

Statistical analysis (comparison) of high-frequency timeseries data for two temperature loggers?

I am working with high-frequency (144 measurements/day) temperature data. It was two individual temp instruments measuring at equal intervals (10 mins) at the same stationary location for 120 days. ...
R Reid's user avatar
  • 1
0 votes
0 answers
18 views

What is this method name for comparing two financial time series by their difference (subtraction)?

I am trying to find a reference/name for what I am doing for explaining it in an academic work. My scenario is that: I have financial time-series A and B. I want to answer if A outperforms B or vice-...
Reuel Ribeiro's user avatar
3 votes
0 answers
39 views

Statistical significance for difference in mean proportions when comparing groups

I may not have described my problem precisely, but I hope I can illustrate it with the following example. Suppose that I have $m$ contingency tables: Col 1 Col 2 Total Row 1 $a_i$ $b_i$ $a_i+b_i$ ...
libcaffe's user avatar
  • 131
0 votes
1 answer
34 views

Help on diivergence in the Paired T Test sample size formula between Machin and others

for a pre-post study, continous endpoint (assume normality). I would like to detect a difference of 50 (mg/dL) and SD of the changes could be easily 20 mg/dL (for ex.). the issue is, according to ...
Alex Ortega's user avatar
2 votes
1 answer
51 views

How can I calculate the minimum required sample size for a one-tailed paired t-test, testing whether the difference is greater than 5?

This Cross Validated answer states that it's valid to do a paired t-test to test whether the difference is greater than a certain value (e.g. 5) by changing the specified value of 𝜇 in the null/...
Alice's user avatar
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1 vote
0 answers
26 views

Evaluate two datasets for corresponding to given pairwise matching

Suppose I have two matched $N \times D$ datasets $X$ and $Y$. The samples are in matched order (with $n$th sample in $X$ being the same object as the $n$th sample in $Y$). The features are (or at ...
Betterthan Kwora's user avatar
0 votes
0 answers
51 views

Best stats test for a resume audit study evaluating bias

I am testing an applicant tracking system and giving it resumes that have implicit mention of race, and asking the system to rank them. There is a control resume with no implicit mention of race. For ...
Bobbi Lynn's user avatar
2 votes
0 answers
120 views

How to tell if two time based data series collected from sensors are different or not?

here I am doing scientific research. My background is informatic, so in that manner, I need some clarification and help. We developed a group of sensors that measure the drainage of the battery during ...
MaxLAB's user avatar
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3 votes
2 answers
104 views

Paired Comparison on $n$ Tests, Repeated $k$ Times Each

Suppose I test two subjects on $n$ pass/fail (Bernoulli) tasks, $k$ times each—for a total of $n\cdot k$ tests per subject. I want to compare the subjects to see if there is a statistically ...
Matthew Anderson's user avatar
0 votes
0 answers
17 views

How can I compare model performance across datasets of varying sizes?

I have a person wearing 2 sensors. I create two models, one using Sensor-1 and other using Sensor-2 data I have multiple people repeating the same experiment with varying numbers. How do I a ...
Darpit's user avatar
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0 votes
0 answers
12 views

what is the equivalent of manova for pretest postest data for paired groups?

how can i test for differences in pretest and posttest of anxiety and aggressive behavior in regards to the experimental group only? noting that i have already conducted a MANOVA and found statistical ...
afifa bendj's user avatar
0 votes
0 answers
13 views

Testing for mederation effect in a paired sample (before and after)

I am trying to test whether Covid-19 impacts the income of companies. For 10 companies, I have the income values for both December 2019 (before COVID) and March 2020 (During COVID). I also have the ...
Md. Maruf Hasan's user avatar
2 votes
1 answer
81 views

How to calculate mean difference for effect size calculation?

For a two-sample effect size calculation on paired data (or a one-sample test on differences), does it make sense for an effect size to be negative for a hypothetical % increase of a mean? I’m doing a ...
Nate's user avatar
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0 votes
0 answers
9 views

Basic question regarding before and after intervention analysis on groups of different sample size

Apologies for the basic nature of this question. I have collected data before and after an intervention and assessed response to the intervention using a survey. This was a basic survey using a 1-5 ...
june2023's user avatar
3 votes
1 answer
94 views

Trouble in understanding the assumptions of paired difference tests

I have some difficulties in understanding the validity of the paired difference tests. Indeed, considering the Wikipedia article about that, it's written that $${\rm var}(\bar{D})= \sigma_1^2/n + \...
MysteryGuy's user avatar
0 votes
1 answer
33 views

A suggestion for a statistical test or Model to Prove the regression results

I am working with the following dataset. (I attached a screenshot of some of my data): Data name is HTO and has the following variables $x$ and $y$, pre- and post-test, and the delta ($\Delta$) ...
Ahmed Mabrouk 's user avatar
1 vote
1 answer
57 views

Which is better: Independent sample t-test or another method?

One hundred people were recruited in two sessions and randomly assigned to one of two groups. Some information about the design and analysis: In Session 1, participants were given gum to chew whilst ...
user avatar
1 vote
1 answer
182 views

What do these Wilcoxon values tell me?

I did a pre and post-test with a small number of students ($n=12$).These values came after a science intervention that took $4$ weeks. I used a Wilcoxon test for 2 related samples as there was not a ...
jordanLeah's user avatar
0 votes
0 answers
11 views

Statistical model for multi-subject multi-trial group comparisons

I am quite a novice in statistics and I have a complex model (at least for me) that I need to build for a test. I have a treatment plan and I am doing some frequency measurements in different regions ...
ozzy t's user avatar
  • 1
2 votes
1 answer
59 views

Paired t-test on dependent samples

I have a set of paired observations, corresponding to patient blood pressure before and after a treatment. I'd like to test for the significance of the treatment by conducting a paired t-test (or ...
Smoked_Carp's user avatar

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