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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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
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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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1answer
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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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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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15 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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1answer
27 views

Paired t-test / dependent t-test (updated title)

I have 2 samples and I would like to demonstrate that they are actually very similar. I tried 2 different methods and I got almost the same results, however I am not sure which one is correct. First, ...
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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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Pre/Post Likert survey analysis with combined questions

A bit of context: I know all respondents answers to a pre-and-post survey Each respondent has a unique ID. I can match all respondents pre and post answers. I have only 7 participants. There are 15 ...
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Paired Samples T-Test or Wilcoxon Signed Rank Test for 35 participants and data that isn't normally distributed?

My data is not normally distributed: Kolmogorov-Smirnov is.026 and Shapiro-Wilk is .037. However I have 35 participants, so a rather small sample size. Should I stick with a paired sample t-test or do ...
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2answers
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what is the difference between a two-sample t-test and a paired t-test

While I was glancing at hypothesis tests, I saw paired and two-sample t-test but couldn't understand the difference. For the explanation of these two tests, I saw the following sentence " Two-...
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n= 29, p value for three tests: .061, .09 and .13 but all trending in predicted direction: How to report? [duplicate]

So I ran three paired samples t-tests to see if people did a certain action more after hearing a target stimulus. my prediction is that they would do the action more. All tests were one-tailed as i ...
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1answer
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Should I raise alpha level to increase statistical power for my data?

I am running a paired samples t-test. n=29. Should I raise the alpha from .05 to .1? I was told this can increase statistical power for this sample size but should it be done? Currently my paired ...
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20 views

McNemar significance test for 5-fold cross validation

I have used stratified 5-fold cross validation to generate five data folds to compare several (N) deep learning models on a single dateset. It is not possible to change the cross validation to 5x2 as ...
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1answer
34 views

Which test to use? Paired or unpaired?

I have a small dataset that was gathered from 1 subject during 1 “session”. At the beginning of the session, the subject performed a movement task for approximately 40 seconds, and completed about 20 ...
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paired data large samples

When comparing the means of matched data and large samples are taken, the differences must be Normally distributed in the population. True/False The answer that was given in class was that it was ...
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1answer
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What is the drawback of using a non-parametric test when parametric alternative could have been used? [duplicate]

I want to analyze the difference between two paired samples. My initial plan was to compare them using the Wilcoxon test because I didn't want to bother checking whether the data is properly ...
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German electricity market: Do I use a paired or an unpaired t-Test for my data?

In Germany, Frequency Containment Reserve is auctioned daily. Participants bid the amount they wish to receive for being able to react in the event of a frequency deviation. They can bid on different ...
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Test to see if differences between measurements are different across groups

Here's a simplified version of my problem. I asked two people to guess the height of people walking by. The guesses were very different. I learned that sometimes estimators would sit and sometimes ...
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11 views

Best methods to analyze the results of a pairwise comparison survey?

I have recently conducted as survey where I was comparing a range of different images. Due to screen size constraints I decided to display these images pairwise and ask the participants to pick one of ...
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Mixed effects versus conditional models for paired analyses

In this CV post I address briefly models for binary dependent data and how they might be used in a paired analysis. Stratification McNemar Test in R It occurred to me: I hadn't previously considered ...
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1answer
36 views

Statistical test for comparing performance metrics of two regression models on a *single* validation dataset?

What is an appropriate way to apply a statistical hypothesis test for evaluating model performance metrics (e.g. MAE, MAPE, MSE) between two regression models based on a single holdout (validation) ...
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1answer
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Stratification McNemar Test in R

I have categorical data before and after a condition (paired data) about preferences (yes/no) and I have other variables such as sociodemographic values (sex, ethnicity, etc). What I need to know if ...
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0answers
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Equivalent of a one-tailed paired t-test for circular data?

I have a set of paired circular measurements representing the timing (in phase) of two different events. I would like to determine whether one event occurs earlier (smallest difference in a counter-...
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21 views

Paired Hypothesis Testing with Conversion Samples

Let's assume I have 100s of websites on which I am tracking conversion. At some point I change something to all websites. I want to measure if there is a statistical significant difference between my ...
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How does one construct “blots” when using the MICE package for MNAR data

Consider that I have a paired data set $[X,Y]$ such that $X$ has missing values while $Y$ is complete. I have sufficient reason to believe that the missingness of $X$ is not random (MNAR) and in ...
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28 views

t test for dependent but unpaired sample

I have two tests on the same groups for students, may be evaluating an education program. If we can paired the same groups of students, this would be paired t-test. But for privacy reasons, so that I ...
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23 views

Paired t-test question for spatially distributed data

I have spatially distributed data at 50 locations for pre and post rainfall. So, 2 data points for each station. All the sites are different. Can I use paired t-test on this data?
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6answers
163 views

Comparing two, or more, independent paired t-tests

Can we compare the results from two, or more, independent paired t-tests? For example: I want to test if drug 1 and drug 2 are effective to reduce weight. I have a control group (that will consume a ...
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18 views

How do I calculate the effect size with paired samples of proportions?

I am doing a meta-analysis and frequently need to calculate the effect sizes from the data since the effect size I am looking for is frequently not reported directly. I am looking at a paper where ...
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7 views

Dependent variables meet different test assumptions - Should I treat them all the same, or individually?

I'm conducted pair-wise analyses. I have a binary independent variable and 17 dependent variables on a continuous scale. To explain the basic premise: An assessor watched an event in person and scored ...
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What statistical test should i use with this data which seems to be a data from “interrupted series design-quasi experimental research”?

0 I am conducting a research, and I am proposing a new format of lesson plan for teachers. I want to prove that the new lesson plan that i am proposing is much more effective than the existing ones. I ...
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1answer
132 views

Is a chi square test appropriate?

I have a dataset which consists of fish density/biomass from two sampling periods (1 and 2) in two locations (A and B). In sampling period 1 locations A and B are both clear, while in sampling period ...
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9 views

How to test whether a paired numbers vector are either weakly correlated or negatively correlated

I have a dataset that is kind of paired and have the following structure (the numbers, which are the scores for the game, are for illustration purpose only): two matrixes in total: Day 1 matrix ...
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15 views

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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1answer
22 views

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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1answer
55 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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1answer
125 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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12 views

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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0answers
38 views

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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0answers
23 views

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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14 views

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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21 views

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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7 views

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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1answer
36 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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35 views

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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0answers
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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