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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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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1answer
50 views
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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2answers
41 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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1answer
33 views
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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1answer
43 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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16 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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25 views
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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5 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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4 views
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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1answer
38 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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1answer
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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1answer
48 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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7 views
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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0answers
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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1answer
50 views
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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0answers
20 views
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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19 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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34 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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0answers
26 views
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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31 views
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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33 views
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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0answers
33 views
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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0answers
14 views
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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36 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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1answer
33 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 ...
2
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0answers
13 views
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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1answer
17 views
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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1answer
30 views
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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15 views
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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31 views
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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1answer
26 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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1answer
19 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 ...
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1answer
38 views
Would a paired or unpaired t-test be more suitable for this dataset?
I have data that measures the temperature of flowers and leaves on different plant species. These are the comparisons I am trying to make:
Comparing the flower and leaf of the same plant at the same ...
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1answer
49 views
post hoc pairwise comparison
I have a model testing whether the modifications to my texts (fixed factor: Modified) affect several measures (for example IA_FIXATION_COUNT). The Texts used in my experiments are 8, and when i want ...
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21 views
Samle size calculation for paired comparative diagnostic accuracy study
I would like to estimate an appropriate sample size for a medical imaging study.
I prefer to use R.
A standard thest testS will be compared to a modified standard ...
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1answer
30 views
Comparing survey data to passively measured data
Basic Situation:
I have quite a large sample of around 10k people.
In that sample I have two values for each person: a passively measured value of an amount of time, as well as their estimation of ...
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1answer
41 views
paired test VS unpaired test
I have a set of paired measurements which were collected before and after some trigger for a set of users. Users can react differently to trigger, i.e for some measurements before trigger are larger ...
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2answers
14 views
Paired / unpaired data - age groups within company
I have (I think) a relatively basic question concerning paired / unpaired data.
I want to compare the mean number of employees in the same company in the same year across two age groups (under 50 ...
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0answers
35 views
What statistical test could I use to compare categories of two data sets (for enrichment) with hugely different sample size?
I have some biological variant effect prediction data. This data can be split into categories based on the biological effect each variant has. I've turned this into two data sets: One is the "full" ...
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2answers
49 views
Weibull Stats for Testing Significance of Ultimate Strength in Mechanical Failure
First, I'll start with some background that may explain the ignorance that will likely be encountered in the remainder of the post. I am an archaeologist attempting to study the flexural strength of ...
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52 views
Comparison of multiple variables in paired data
I'm trying to visualize/analyze some data but unfortunately I don't know which would be the right way to approach my problem. My apologies if the question appears somewhat vague: the scenario ...
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0answers
16 views
Why several studies change logical paired/unpaired assumption from omnibus to post-hoc?
There are several studies of highly-referenced researchers where a paired post-hoc test (e.g. Wilcoxon signed-rank) follows the omnibus unpaired test (e.g. Kruskal-Wallis):
From Huang et. al "THE ...
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22 views
How to calculate the significance of slope and y-intercept using a permutation test of pairwise fst x distance
I have two variables,
1. scaled pairwise Fst (measure of genetic differentiation between two sites)
2. river kilometers between the two sites.
The values are not independent (all of the sites are ...
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15 views
Can I use UNPAIRED post-hoc analysis for PAIRED omnibus testing?
If I have a omnibus statistical test with unpaired assumption (e.g.Kruskall-Wallis), could I ever use the opposite (paired) post-hoc analysis? (e.g. Wilcoxon signed-rank for post-hoc analysis of ...
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1answer
95 views
Weighted Pairwise Comparison With Table-like Heterogeneous Data - Is Bradley-Terry Model The Right Choice?
I came across this library Choix. I want to do Pairwise Comparison on data that looks like this to output a ranking from best to worst.
Let's call this X:
...
