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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Lilliefors test for paired series + Bonferroni correction

I got two series where I want to find out if they differ. The two series are paired meaning they are values for the same subjects. N = 21 After: 0.87348565, 0.88276705, 0.89083918, 0.89520159, 0....
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Can I make any conclusion from this insignificant t-test result?

I am analysing the food intake rate of monkeys in a tree over the duration of their tree occupancy. I am looking at the intake rate in the first quarter of their occupancy duration and comparing to ...
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49 views

Is Bonferroni correction needed for paired t-test on grouped data?

I have a survey that was conducted in 3 different classes ( math, phys, bio) at the beginning and at the end of the semester ( pre and post). In the survey, there were 3 groups of questions (A, B, C) ...
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106 views

Paired and repeated measures! Now what? ANOVA or mixed model?

I have a simple setup. I have 10 patients and I would like to test the effect of a certain drug on kidney function. Each patient will serve as his own control and intervention. First for the control ...
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What analysis to use to compare means for when subjects are paired with multiple subjects?

I have 2 sets of data that are connected like below: As you see, each ID in set 1 might be connected to at least one ID in set 2 and vice versa. My aim is to compare the values of variable B for ...
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Choosing correct multiple comparison method for proportions

I am examining pairwise differences in proportions. I have 19 groups giving a total of 171 comparisons in a data set with $n \approx 40000$. I am unsure about which multiple comparison adjustment that ...
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Question on how to do the randomized paired design on LED bulbs

Want to compare the average lifetime of LED bulbs under two different temperature settings, namely, $S$ degree Celsius and $T$ degree Celsius. Suppose that the distribution of the bulb’s lifetime is ...
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General advice on bootstrapping procedures

This is an open ended question as I am looking for advice and resources. Any suggestions and reference recommendations would help a lot. I have two datasets, each containing $n$ observations, denoted $...
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Binary data of MCQ for paired T test

I am designing an experiment where I need to measure developer awareness after the introduction of a tool. basically taking 4 questions in pre and post-survey to measure increased awareness using the ...
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is mcnemar's test suitable to evaluate the differences of the proportions of events between the subgroups of risk scores?

the authors indicated that comparing event frequencies of events between subgroups( example frs and df) of groups ( low intermediate high) mcnemar's test was used. is it right for this study design?
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Comparing paired percentages with a constraint

I would like to compare two variables, which are paired and both contain percentages. The sample size shall be large enough (>100), so I do not consider applying any nonparametric method. However, ...
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Indirect distribution comparison

So in my experiments I have a resting state and a task state. I analyzed my data and then compared those two states (Wilcoxon test). I then realized that some predefined parameters of the very first ...
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21 views

Paired t-test with multiple measurements per pair

I'm measuring a property of tissue using two different tools A and B. I've made 10 measurements with A and 10 measurements with B, on the same tissue. I've performed these measurements on 8 different ...
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Expanding the 5×2 cross-validation with a Modified Paired Student t-test

I have run multivariate linear regression on three datasets, which share a common output (only the input features differ). These three datasets are paired (e.g. observation 1 in the first dataset is ...
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Is my data paired/unpaired?

I am sending out a survey about generalist/specialist species. I intend to compare the generalist to each matched specialist of the same taxonomic group. Respondents can answer for any species which ...
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32 views

Test for differences in paired data

I am unsure which statistical test is appropriate for my data. A simple paired t-test seemed correct at first however I no longer think this is the case. For my data, I want to know if the animals ...
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27 views

Sample size for paired Wilcoxon test

I would like to perform a statistical test in order to compare the results of a new machine B vs the results of the current machine A. The data are in form of count values, that's why I am thinking a ...
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Acceptance criteria and sample size for paired semi-quantitative data?

I am trying to perform a comparison test on multiple variables, in order to compare 2 montages (A and B for example). Lots of variables are semi-quantitative, whose values are under a limit of ...
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Compare Variance of Scale Responses, with dependency/repeated-measures

I've had participants answer the same question about four different social groups. For the sake of example, let's say they rated the conservatism of aliens from planet A, aliens from planet B, people ...
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Correlations comparison between trialgroup and controlgroup using SPSS

I am new this community site and I need your help. The data below needs to find out how to get correlations pairs between trial group_store_NBR (store1 as 5) and control group_store_NBR. ...
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24 views

Comparing non-parametric correlations

I have two correlation (Spearman's rho) matrices from a single sample (before/ after intervention) and I would like to compare them to see whether intervention changed each or some of these ...
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9 views

Paired sample survey across multiple variable

stats are not my strength. I have ran a survey tracking the percentage of a practitioners caseload of various diagnosis (7) pre- and post-covid. I have about 200 samples, each paired. My confusion lie ...
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Best practice to code t1 to t2 change from two separate t1, t2 variables?

Supposing that I have two variables, attitude_t1 and attitude_t2, each measured with a 10-point scale (0 to 9). What is the best way to create a single variable that could reflect the change in t1 to ...
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Two-sample test + paired/independent samples

This might be an easy question but I got lost in my thinking so thank you for clarifying that for me. So I have some troubles with understanding the ideas of two-sample tests in addition to paired and ...
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41 views

Paired or not paired t-test in untreated/treated experimental setup

I am analysing the experiment, where the cells isolated from 4 different healthy donors were treated with a certain substance or left untreated (cells from each donor were divided into 2 parts: 1 part ...
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Which model to select if paired-t-test do not show significance?

I have two classifiers: A and B. I have run 10-fold-cross-validation for both classifiers. A has better mean accuracy than B. Here are the scores: A: [0.82, 0.9, 0.88, 0.86, 0.88, 0.92, 0.84, 0.98, 0....
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31 views

Should I do the multiple comparisons after the 2 between-group paired t-test?

I have some problems with my statistics. I need to help. I have about 8 different variables on 14 subjects. Each variable contains 5 regional and 1 total value. Thus, the total number of variables is ...
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18 views

Paired Permutation Test for model comparison with repeated cross validation

I have two identical models, trained on two different sets of features. I randomly divide each of the datasets into train and test (80%/20%), 50 times (monte carlo cross validation). Now I would like ...
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23 views

Performing Paired Sample t-test on sampled height measurements when using different platform sensors?

I’ll be upfront, my Achilles’ heel is understanding how to apply statistics. I want to test/compare the relative accuracy of sampled height points created at set intervals (say 50 metres) along a 1 ...
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47 views

How to statistically compare the same classifier on two different sets of features?

I have two sets of features (A and B) and I would like to compare the performance of the same classifier, trained on each of these sets. The two sets correspond to features taken from the same ...
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26 views

Paired test vs non-paired test

I wanted to ensure my understanding is right ... 1) Paired test: We have two (or more) dependent populations, having therefore dependent samples Non-paired test Two (or more) independent populations, ...
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21 views

Comparing individual proportions

I am designing an experiment where each subject performs a selection of items in two different conditions, treatment and control. Among 20 items, they can choose as many as they want. Some of those ...
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3answers
55 views

Paired t-test results

I'm running a paired t-test to compare before and after counts. Here's what my data looks like: before <- c(102,122,64,0) after <- c(38,39,23,16) Here's my ...
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28 views

Correlation of correlations

I have the following datasets: ...
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Analysis of data collected from the same sample, but in two experiments

My hypothesis is that users who used application X will have lower satisfaction levels than users who used application Y. My collected data-set looks like this: +-------------+-----------------+------...
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26 views

Test for equality of distributions for paired (overdispersed) count data

I have overdispersed count data with an excess of zeros. I split them into a training and a test set and tried to reconstruct its distribution through the training set. I then sampled from these ...
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10 views

Paired Samples T test suitability?

Just want some clarification regarding an analysis I am currently doing; have a set of data collected; some variables used to calculate a score A and some variables used to calculate a score B which ...
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9 views

Optimizing models for paired analysis

I want to train a model to classify pre and post samples for 50 patients. The algorithm needs to discriminate ...
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35 views

Comparing two sensors timeseries that measure the same variable

I have data on one station provided by two sensors that measure solar radiation, let's call A and B where A is the more accurate and the B the less accurate one. The plot show data from one hour ...
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1answer
45 views

Statistical analysis of paired count data

I have conducted an experiment where groups of animals were allowed to select between different substrates. I had a tank with four different substrates (increasing in complexity from one side of the ...
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39 views

Paired t test: check normality with residuals or paired differences (or both)?

One of the assumptions of the paired t test is that the underlying data is normally distributed. I've read either the paired differences should be normally distributed, or, that the residuals should ...
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2answers
49 views

Appropriate test for matched data (outcome with 4 levels, two groups)

I am analyzing differences between two cohorts that have been matched 1:1 (using R matchit) for age and sex. I have several variables where I would like to know whether there are significant ...
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52 views

Equivalent of paired t-test but for categorical data

I'm attempting to analyze survey results that asked respondents to indicate whether a statement was true for them at the start of their career vs. now. They could also select both at the start of ...
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47 views

Can I conduct a paired t-test to compare regression coefficients?

I want to compare the regression coefficients for two variables from the same sample. My models may look like this: $$ \hat{Y}_1 = \alpha + \beta_1 * V_1 + \beta_2 * V_2\\ \hat{Y}_2 = \alpha + \beta_3 ...
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Comparing AUCs: Same Control, different Test Group - paired or unpaired? pROC

I want to compare two AUCs using a bootstraping method from pROC package (roc.test). I have done a classification using Logistic Regression: 1. Cancer (high risk) vs. Control = AUC 1 2. Cancer (low ...
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26 views

Checking for consistency and selecting the best among multiple measurement techniques

I am tasked with comparing $N$ statistical analysis methods (where $N$ is relatively small, say $N=5$), possibly not independent, for estimating some quantities $X,Y,Z$ based on some given data. Each ...
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47 views

Paired t-test for different observed parameters - Should I use multiple compairaison's tetsing and how?

I have a group of rats that each go through two treatments: Control (No stimulation) and Laser stimulation. For each treatment I obtain several number of parameters such as Attention score, number of ...
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12 views

Classification with paired data

I have a set of data with predictor $X_{i,j} \forall i \in [1,N], j \in [1,2]$ for $N$ paired items in 2 classes. The full distribution over $X_{i,j}$ is not informative of class identity; however, ...
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54 views

Focal Predictions from a linear model: How to test for difference between factor levels (pairwise) instead of comparing errorbars?

Sorry for the cluelessness, I know this is a topic that arises often in different variations. Still, I couldn't find an answer for my situation. In my work, I sample people and try to generalize the ...
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There is very slight difference but also statistically significant. Could there be a mistake?

In my study to investigate the effect of filter glasses on reading speed and contrast senstivity in albino patients, there is little change in the reading performance level n:61 patients Reading ...

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