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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Compare two stores in specific products price (Non-parametric model?)

I have two stores with products and prices, I want to check if there is a systematic difference in product prices between the two online stores? I chose the Mann Whitney U test but how I can confirm ...
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Pre-study sample-pairing validity (two same-scaled IVs, binary DV)

Summary: is pairing samples ahead of time okay for testing? What test do you use given the resulting assumptions? Overview Goal: The goal is to determine which IV has a stronger influence on (...
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Model for comparing two ordinal dependent variables

I am trying to do a within subjects comparison of two 5-point Likert scale questions and seeing what influences the differences. I have a number of IV's (all categorical) that I used for ordinal ...
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1answer
42 views

Possible to use linear regression instead of paired t test?

I have participants who were measured two times. First, without any intervention. And second, with an intervention. Thus, I should use paired t-test as both measurements are normally distributed (...
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31 views

paired t-test for two different samples and measurements taken in two different years

I measured hourly temperatures of site A and site B in June 2016 and June 2017. I used paired t-test to compare the means of site A & B for June 2016 (n=720) and p-value was 0.07 (significance ...
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33 views

T-test on two sets of observations from different distributions?

I'm comparing two implementations of an algorithm, and want to find out if one implementation (A) is better than the other (B). I'm mostly interested in the execution time. I have N test cases, each ...
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Consequences of paired healthy and diseased samples in machine learning

Consider a set-up in which we are using machine learning to classify between healthy and diseased samples. Obtaining the data requires some invasive procedure - therefore all the healthy samples come ...
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23 views

Tests for paired data

We have a paired data of before and after drug and placebo use and its effect on Systemic Blood pressure. The question at hand is " There is more than one way to make use of the baseline ...
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1answer
30 views

Compare mean heart rate after drug administration with multiple time points against baseline

I want to compare mean heart rate change from baseline (T0) within the group. There are 10 continuous time points (T0,T1,....T10.) like t1 vs t0, t2 vs t0, t3 vs t0.. what test should i apply ? paired ...
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Asked to create data set where magnitude of paired t-test statistic is very large, but pooled t-test statistic is small. Can't find any resources [closed]

It seems almost impossible to make these tests diverge by much. I have tried making the variance for one distribution much larger, or much smaller. I have found a data set where the paired is a good ...
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45 views

Control covariates in paired t-tests (pretest-posttest design)

Suppose we have a naïve single-arm pretest-posttest design without any control group. Every subject has a pretest score and a <...
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Does it make mathematically sense to aggregate data in order to reduce variance in statistical significance tests?

Let's consider an e-commerce site. We have an AB test for which we want to measure if the average revenue from treatment A is statistically significant different from B. i.e. the main goal is to ...
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Comparing two means from the same respondents taken at the same time without confidence level

I have a question about comparing the means of two dimensions both relating to the concept reputation. Information about survey research I have conducted a survey that measured three dimensions ...
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Comparing paired samples in mixed-effects model

I am hoping to determine if there is a statistical difference between test results from samples taken from the same site in the same year. For all samples, they fall in to either two categories: the ...
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1answer
69 views

Is this an appropriate application of a paired T-test?

I have some background in stats and math but it has been a bit, and I'm not sure if there is some nuance to this question. We have 15 chest x-rays for pre and post treatment effect. We have three ...
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1answer
34 views

How to analysis the repeated measured study where combine with matched pairs?

I am doing a study to evaluate the effect of treatment on eyes. The purpose was to explore whether the level of X protein is different between treatment group (sick eye) and normal control group (...
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2answers
57 views

Mean difference analysis for a paired data with zero inflation. Can Wilcoxon test work?

I have a set of data that represent the sum of white matter streamlines termination in 64 regions of interest in the brain surface collected from 40 subjects. Below is an example of a paired data of ...
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9 views

Comparing percentages of cell subpopulations

I have data on T cell bone marrow subpopulations in a large cohort (> 300) of lymphoma patients. I only have the percentage of each subpopulation for each patient. I would like to compare the ...
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1answer
104 views

Ratio between two values with confidence intervals

I have two integer values, each with confidence intervals, and I want to calculate the ratio between the two values. My strategy would be to find all the pairs of integer values within the CIs and ...
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How can i set up both paired and unpaired data for t test in SPSS?

My study involves a pre- and post-test knowledge score. However, due to participants not understanding the unique identifier code generation, some of the data collected is not able to be paired. Some ...
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1answer
44 views

Determining sample size for comparing rate of occurrence between two groups

Scenario: You are running a comparative clinical study. A test product is being used by one portion of the population (Group T) and a control product is being used by another (Group C). The Question: ...
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105 views

Comparison of Coefficients of Variation in paired groups via Bootstrap

I need to compare the variability of measures between two groups of observations. The observations are paired : the first group (G1) consists of observations made 12 years ago for 40 Belgian cities ...
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24 views

Questions around mean comparisons between groups

I'm trying to understand the process of comparing groups and I have a number of questions with Google searches giving me more questions. And unfortunately I'm a person that can't move forward without ...
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Can I do a paired sample t-test if correlation of the variables are exactly -1? [duplicate]

What is the correct way of analyzing the paired choice data? When users choose between option x and y with the following options: I like x more than y or y more than x or equally like them both. Can I ...
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35 views

Multiple observations – Wilcoxon matched pairs test R [closed]

I’m dealing with matched pairs graphs in R but I’m not sure there’s a way to keep my dataset as it is and make a graph out of that. Let me explain better. Let’s say I have to take into account 3 ...
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1answer
27 views

Wilcoxon test or paired T test for matched data

I am working on comparisons between two time points 2013 and 2019, I have 180 subjects. I have a numeric "score" from 2013 and 2019. I calculated the average score at both time points and ...
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51 views

No significant interaction in OLS, but significant in pairwise comparison

I have two independent categorical variables — (i) A: {1, 2, 3}, (ii) B: {0, 1} — with a continuous outcome variable ...
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1answer
23 views

Matched pairs design: individual confidence intervals for pre and post

I have a matched pairs design. I have a 2x2 table showing success/failure in pre and post: Post (yes) Post (no) Pre (yes) 0 10 Pre (no) 20 30 My colleague would like a confidence interval on the ...
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1answer
46 views

paired t-test, re: sample size calculation

We are performing a clinical intervention, that we believe will significantly improve some parameters in patients. We expect that the intervention will be successful 85% of the time (it will either be ...
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3answers
89 views

What Statistical Test to use to determine significant difference between ordinal variables pre and post intervention

I have a variable that has 4 levels low, med, high, very high. The variable is from two time points, in 2013 and 2019, assessed using the same survey on the same subject/study individuals. I'm ...
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1answer
34 views

Interaction for dummies

I used an OLS regression to find correlation between wage gaps and skill similarity in a paired combinations data (ie. A|B, A|C, B|C). To expand the analysis, I included workplace gender distribution ...
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18 views

A GLM model for paired data (treatment vs. control on the same subject) nested within time points

I have an experimental design where I took the left and right brain hemispheres from mice across several time points (hence its cross-sectional) following treatment at time 0 to the left brain ...
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260 views

Paired t-test with multiple observations per pair

I have a bunch of websites websiteA....websiteZ for example. Now I have an optimization technique that possibly improves the performance of these websites. I want to check whether this technique ...
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1answer
54 views

One-sided paired t-test vs two-sided paired t-test

I am writing a grant, where we have a prospective cohort study and 4 hypotheses. Our hypotheses are directional, that is, we expect significantly increased values in hypothesis #1,2,3; and ...
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Paired test - measure constructed from the maximum of N other measures

Situation: I have n participants and N + 1 measures for each participant. I want to compare the mean of the first measure against the mean of the participant-wise maximum of the other N measures, with ...
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21 views

Question on paired, unpaired data and t-tests

I am still a student and learning my way into stats thinking and your help would be very appreciated. I am working with a corpus of words that also provides frequency values for each word. Out of a ...
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1answer
11 views

Which Statistical Test to predict DV using paired data and several IVs?

What I have is a hiring analysis where we have a Dependent Variable for pre test and post test for a paired sample (same location's hiring success measure before and after treatment). I also have a ...
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95 views

Pairwise paired t test, arguments don't not have the same length

I have a data frame structured liked this: ...
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1answer
56 views

Is paired sample t-test valid test? (multiple data points before and after the intervention from same subject)

We are looking at 60 days of a product sales data from a single store, 30 days before and 30 days after the intervention (second display). We need to evaluate if introduction of second display ...
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11 views

2x2 Table and comparing proportions across Treatment and control group, and within a group

I collected data were pairs of participants interacted in a strategic game with two choices each, A or B. Thus, the four outcomes are (A, A) ; (A, B) ; (B, A) ; (B, B). In the image (output) the ...
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1answer
43 views

Repeated measures ANOVA / paired t-test on different sample sizes

I have multiple subjects walking under three experimental conditions to investigate how the step lengths are affected. Each subject performed all three conditions but the number of steps recorded is ...
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1answer
49 views

How to compare paired qualitative data?

I would like to compare two methods on qualitative and paired data. To summarize my study for you (it's for an internship), I have activity values ​​that were measured on 13 sites, for 12 species of ...
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1answer
29 views

Paired data comparison: What statistical method to use?

I want to analyze the difference of two data collection rounds which took place in two different years with the same sample. Companies were asked a few questions and afterwards the answers were ...
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9 views

Test for random guessing in paired comparisons

I have data from different individuals' choices on a two-alternative choice task. In this case, there are 15 options, leading to unique 105 comparisons. I would like to know whether people were ...
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2answers
248 views

McNemar-Bowker exact test in R: difficulty interpreting the results

I am trying to use the McNemar-Bowker test to test the difference in performance for 2 classifiers. Since my input matrix is sparse and the sum of some of the symmetric cells is less than 10, I am ...
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181 views

Find the most similar pairs from two data sets

To cut a long story short, I have two datasets with $n$ data vectors each. Every vector contains a lot of features/variables. I am looking for a method of finding $n$ pairs that contain two data ...
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27 views

Comparison of experimental method against gold standard?

I have a method X, assumed to be the gold standard. Then, I have a method Y. The response variable (for example, weight) is a continuous variable. For a sample of n individuals, the response variable ...
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21 views

how can I generate GEE or paired data with multivarite normal distrubition?

I want to generate paired data and all variables must have multivaritare normal distrubition. help me please , I have not find any codes for paired data from multivaritare normal distrubition . I ...
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36 views

Paired data in a lmer with repeated measures in R?

I have a dataset consisting of a measured variable (height) repeated over many days for multiple individuals (id) and at 3 different times per day (Morning, Day, Night). I want to know if the height ...
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Is the wilcoxon signed-rank test suitable for zero-inflated data?

I have data that look like this: (There's 285 entries) These are paired data, in that each line represents a single seal group that has been counted for entanglements using two different methods of ...

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