# 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 T-testing or ANOVA?

I have data of the structure below. im confused about using paired sample t-testing vs ANOVA. Paired T-tests make sense to me, but im worried; because there are 7 outcome measures, am i violating some ...

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### Compare intervals on a number line in R [closed]

Is there a good charting library in R, maybe ggplot2, that can compare two intervals on a simple number line? I drew the following to show how treatment affects 20% to 57% of men and 10% to 55% of ...

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30 views

### Comparing experimental and control group consisting of two measures for each participant

I'm conducting an experimental study. For each group (treatment/control) I have measured the biometrics of both eyeballs (left/right) of each participant.
Can I make a comparison between values of ...

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19 views

### How to plot a 100 variables paired t test and correlation matrix

I have more than 100 variables from a biological data for which I have values for before and after surgery. I am doing two analysis:
A paired t test for before and after measurements.
A ...

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15 views

### How to analyze clinical outcomes after propensity matching

Suppose I have two propensity matched groups whose covariates are balanced. How do I analyze clinical outcomes between the groups. I would be interested in overall survival, one year survival, and ...

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### Using paired t-test or Sign test to compare two groups of correlated measures on the same subject?

I have conducted a survey where participants are shown 8 different advertisements: 4 of the ads attempt to evoke the feeling of guilt, 4 others attempt to evoke the feeling of shame. After seeing each ...

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### Paired Comparisons and Ranked Lists

Here is a brief description of my experiment, to help you understand the data and question
Individuals perform pairwise 2AFC (alternative forced choice) comparisons between two categories of items at ...

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19 views

### One Way ANOVA or One Way ANOVA with repeated measure

I have LFS spanning 24 quarters, and I want to look at the effect of a policy on the sickness absence of a particular occupation. I want to use ANOVA to see if there is a statistically significant ...

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### How, if ever, is quantile linear mixed model compatible with the signed rank test?

Paired Wilcoxon test evaluates median change rather than difference in medians.
Quantile linear mixed model (defined for medians) evaluates change in the medians, rather than median change, as any ...

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### Does mixed model of change evaluate mean change or change in means?

Paired t-test evaluates mean change. Mixed models evaluate change in means. How the two can be compatible? For balanced data it works - paired t-test = random intercept model = GLS with compound ...

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### Which significance test should be used to compare models based on Monte Carlo (holdout) cross-validation?

I have created two machine learning models and want to run significance tests on the results of various metrics (sensitivity, specificity, Cohen's kappa etc.) to see if there's any statistically ...

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### Mean difference with paired pre- post- data, don't care about direction of change

I think I've confused myself into a corner. I have a pre- and post- measure, and the change is sometimes +ve and sometimes -ve. I want to see if there's a difference, regardless of sign change. What ...

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23 views

### Coding data for regression on unordered pairs

I want to fit a regression on "unordered paired data", but I'm uncertain on how to code it. What I mean by paired data is the following:
The model looks like this:
$$o_i \sim \text{Binom}(1,p)\\
f(...

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15 views

### Calculating Standard Deviation of difference of means from summary statistics

To conduct a paired T-test, I need to know the standard deviation of the difference between two means.
How can I find this out using summary statistics alone (the mean of the Kappa value for each ...

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15 views

### What is an appropriate repeated-measures approach for statistically comparing results from two different methods?

I have a diffusion MRI dataset, with values of white matter tract volume and fractional anisotropy that were derived using tract masks generated from two different tractography software packages. I ...

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### In a paired test, what constitutes a valid pair?

The title is my question, here is a little more information. I was checking off on an analysis done by someone else and they used a paired t-test on data from the same subject; however the difference ...

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16 views

### ANOVA testing for User Activity on a website

Problem:
I am trying to determine whether visitors on a web-site are more likely to
perform a certain action (click a specific button in this case) if they view a specific section on the website. I ...

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49 views

### Multi-variable logistic regression for paired data in SPSS?

I was hoping for some assistance regarding performing a multi-variable logistic regression for a matched data set. I am not formally trained as a statistician (biology trained with basic stats/SPSS ...

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### How to control for within-subject covariate in a single-arm, mirror image study design?

I have a mirror image study which consists of one group of subjects, and they have a measure before and another measure after an intervention.
Depiction:
Single group: Measure#1 -> (Intervention) ->...

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44 views

### Can a paired t-test be applied when there is no strict pairing but data come from same individual?

The question is if it is possible to apply a paired t-test in the following situation:
Let's say we have conducted an experiment to measure how long does it take to perform a task under two different ...

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17 views

### Paired T-Test Question

If you have two paired groups (group A and B) and want to determine the difference in the two means, you would use a t test for two related populations. However, what if you want to determine the % ...

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### Can a t-test be used with data from several individuals?

I have turning data for animals in different conditions with comparisons of before and after these conditions, we'll say condA, condB.
Each animal has 3 repeats on both conditions, where before a ...

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6 views

### Comparison of parameters across multiple panel data regressions

I am estimating a set of ten different regression using two different samples. The first sample includes all observations in the panel while the second panel is restricted since observations prior to ...

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### Two diagnostics tests over time

I have the following problem. I want to compare a self-diagnostics tool (questionnaire based) with a gold standard diagnostic tool. However, I have the following issues:
1- The gold standard is not ...

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22 views

### Paired t-test or comparison of difference?

I want to compare anxiety levels of participants before and after an intervention in two groups. Firstly, I intended to use paired t-test, but I realized that there was a confounder that might effect ...

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39 views

### How to conduct statistical analysis on two-eye data

I am new to statistics and I would appreciate some help with this analysis that I need to complete.
My dependent variable: myopia (binary- yes/no)
Since each individual contributes two eyes to the ...

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15 views

### Rank correlation with only incomplete pairwise comparisons?

I am studying the online ad ecosystem and would like to study the relationship between prices advertisers pay to show an ad and the preferences of users.
In particular, I have a set of observations ...

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19 views

### Comparison Statitics

I have 100 respondents from whom I have collected trip data for 3 months. I dont have control group or base condition.
I want to measure if the proportion of aggressive trip (Trips with atleast one ...

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52 views

### Why is one mean not significantly greater if every element is greater than the other group?

the mean of group C and every element in group C is greater than its row-wise peers. Why is the Tukey comparison giving insignificant P-values?
...

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### Pre-Post with three Experimental and 1 control group and ordinal data

I need your help. I have conducted a study with three intervention and one control group.
Now, I want to analyze the (ordinal scale) data for pre-post effects.
What do you think, which test would ...

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34 views

### Approximate discrete data by the normal distribution before doing a statistical test assuming continuity? [closed]

I have n subjects in my experiment, repeating 3 times an action, each time resulting in a success or a failure. These 3 repetitions are IMO not independent because the subject could improve over time. ...

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### How and when to use paired t-test?

In a study of the effectiveness of weight loss programs, 47 subjects who were overweight, at least 20% participated in a group support program for 10 weeks. The weight of each subject was taken at the ...

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### How to statistically compare pairwise distributions?

I do 5 different measurements for each of my samples, measurements A to E.
The measurements are gene expression values for different genes, I want to see whether the value of A is correlated to any of ...

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20 views

### How to test the effect of the binary factor on the paired measures?

I have the pre-post paired measures before and after the exercise:
...

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42 views

### Take paired data into account in lmer mixed model

I would like some help with setting up a linear mixed model with paired data.
I have a dataset where each participant is tested twice: either with a manipulation or without a manipulation. There are ...

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### Are there any simple pairwise comparison tests suitable for comparing emotions?

So, I'm pretty new to using statistics in a research context. I am currently writing my thesis in didactics of mathematics. In my study, a group of $10$ students are to solve two different ...

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### comparison of two biased coins, flipped by biased observers

We have 2 coins that we don't know whether they are biased or not. M observers, each flip each coin N times and get fraction of heads to total flips of $p_m^1$ and $p_m^2$. Therefore, for each coin i ...

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### How do two of my Wilcoxon signed rank tests have the same p-values?

I'm running a statistical analysis where I'm comparing land surface temperature in matched equal sized areas (project areas and control areas) of different cities. In each city, I do it for two ...

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### How to do a comparison between A or B between ten samples

I am planning a research which will go as follows,
There will be ten participants and each will perform the same exercise. However they will be wearing the variant A or variant B of the garment we ...

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### Paired non-parametric test for a difference in variance

I have $N = 391$ paired data points $\mathbf a = a_1, \ldots a_N$ and $\mathbf b = b_1, \ldots b_N$.
Both $\mathbf a$ and $\mathbf b$ are approximately normally distributed with a mean of zero.
I ...

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40 views

### Another solution than McNemar test for bilateral asymmetry on binary data?

Let's say I studied the shoulders of 10 individuals, and I scored the presence/absence of a criteria (ex: arthrosis, presence=0;absence=1) on the left side and the right side.
I need to test the ...

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34 views

### Paired t-test between different algorithms: Properties of paired t-test

Suppose,
Accuracies are:
Algorithm 1: 87%
Algorithm 2: 86%
Algorithm 3: 88%
Paired t-test value between Algorithm 1 and Algorithm 3 is p = 0.44
Paired t-test value between Algorithm 2 and ...

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### Paired sample: Two-tailed and one-tailed

In the book: "Essentials of Statistics for Business & Economics", the part about matched sample t-test, I see that it uses the two-tailed t-stat. However, instead of stating the null and alternate ...

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17 views

### Paired experiment with trinomial response - Analysis help!

I'm looking to analyze data (in SAS) from a trial investigating the effect of a particular protective padding on preventing skin irritation at multiple body locations among spinal surgery patients.
(...

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### Dissimilarity or distance metrics between pairs of values

I have cubes (objects) in which their volume was manually calculated (let's call this method the "manual method". Assume that the volume measures obtained by this method are considered the "true" ...

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### Planned comparisons with ridge regression

I have a data set that consists of 1 response variables (e.g., response time) and 20-30 predictors variables with a mixture of categorical and continuous data. I code the categorical data into dummy ...

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### Quantifying error with paired measurements from multiple conditions

I have a set paired measurements (continuous values) obtained using different sample types and different methods. I.e., for each subject, I have measurements for samples A and B each on device 1 and 2 ...

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### Paired sample, quasi-matched controls, and a covariate - ANCOVAs in R?

I have been going around in circles on this question for a while, so figured I'd resort to the expertise on stackexchange.
My data: I have performance on a multitude of functional tests taken at 2 ...

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28 views

### How to adjust a confounder in pre-post analyis

I have a paired-dataset of pre and post-surgery measurements of certain biomarkers. I have done a paired t-test to find if there is a difference in the levels of a biomarker, say x1, before and after ...

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23 views

### Mix of paired and independent data analysis [duplicate]

Is there any data analysis that can be performed on both paired and independent data? For example, we have scores on a questionnaire for individuals who were exposed and not exposed (control) to a ...