Paired data arise when the same subjects are measured in two different conditions, so that for each individual subject there is a pair of measurements. A paired t-test is a widespread example of a hypothesis test for paired data.

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Paired t-test for repeated measurements, but with 2 missing samples.

I am doing a gene expression analysis on blood samples collected from the same 8 goats. My sampling points are before LPS-treatment (0h), and 1h, 2h, 5h and 24h after treatment. I want to compare the ...
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11 views

Paired or unpaired data - which test to use?

I have a data set representing interpersonal relations between members of a certain group. I calculated two sets of centrality measures for this population. To calculate values for set A, I used data ...
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15 views

How to analyse paired data lacking pairing information?

A colleague has a dataset from a before and after study looking at a continuous outcome that was measured in individuals before and after an intervention. An unknown but not insubstantial proportion ...
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19 views

Dealing with seeming outliers in microarray gene expression data

I have the following microarray gene expression data for one gene let us say. BTW - have similar data for the same subjects across 17000 genes, so I am looking for a generalized solution. ...
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21 views

Statistic test that check difference of proportion in paired data

I want to announce that my algorithm (denoted by A) is better than some state-of -the-art algorithm (denoted by B) I have n samples which are sentences from the wall street journal and for each ...
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1answer
18 views

How to work with repeated measures data paired t-test where sub groups seem to show opposite effect?

I have data that looks like this for repeated measures for the same subjects. Note, the flag column is something I just added to indicate whether there is an increase or decrease in pre vs. post for a ...
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7 views

Designing paired samples of Group A vs. Group B+C

I have decided to use a strict bioinformatics algorithms that under its way calculate fishers exact test. My samples are to parentals A1 and A2. These were treated and subgrouped into 14 clones. Two ...
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5 views

Difference of means in 3 dimensions (Hotelling's T^2 for 3 dimensions or equivalent)

I am trying to determine if two groups are different in 3 dimensions (3 variables). I am looking for something similar to Hotelling's T^2, but for 3D instead of 2. I have two groups 'Known Color' and '...
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13 views

Applying paired t-test to compare averages

So I did an experiment for 1 month where I investigated the change of pH of 3 different types of milk in the refrigerator and room temperature. I d now like to compare the results of each type of milk ...
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36 views

Can an independent t-test be used on paired data when the pairing is unknown?

Suppose the effectiveness of a training course is examined, and performance of each individual in a group is taken both before and after, and the differences are compared in a paired $t$-test. Would ...
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90 views

Paired independent sample t-test?

I have two methods of processing certain data, where one is a more advanced version of the other. After processing the data, the output is scored from -1 to 1. I have a set of 7 distinct data points ...
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1answer
57 views

Weighted, Paired-Sample T-test? in R [closed]

In R you can run a paired t-test (e.g. t.test(x, y, paired=TRUE)) as well as a weighted t-test (e.g. ...
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25 views

Paired or non-paired data? comparing two sets of scores from same individuals

I have data from four companies, W, X, Y and Z. For each company, three groups of 5 individuals (15 individuals total) take part in a test. Every individual takes two tests, test A and test B, with A ...
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9 views

How to show that one series of observations are faster that another series for them same task statisitcally

Hi I have a dataset consisting of two series of observations (times to reach a goal) of users performing a task. Each observation is paired with another one in the other set representing exactly the ...
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3answers
61 views

Correlation of two categorical variables

I have a list of N people, with two equivalent test performed (A and B), which can have as outcome 0 or 1 (cancer positive or negative). Test A is the accepted gold standard. Is there any way to find ...
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2answers
37 views

Comparing mean test scores (different tests, same group)

I have the following problem: There is 1 group of students (student 1, student 2, ..., student n) This group of students takes several tests (math, French, Biology) - all scored as percentages (e....
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2answers
66 views

What statistical test is appropriate for paired data where the same subjects are tested at multiple times?

In the test in question, we have data [measurements of discomfort] for the same subjects with different virtual reality experiences. We took multiple measurements of discomfort over the course of the ...
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1answer
28 views

Pair t-test or Welch's t-test on a non-normal data series?

I have rainfall time series of 85 points from 1901-2013. I want to check whether the mean rainfall during 1901-1970 is significantly different than that of the mean rainfall during 1971-2013. Here, ...
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41 views

Difference between paired t-test and repeated measures ANOVA with two level of repeated measures

Would paired t-test and repeated measures ANOVA with two level of repeated measures on the same data give the same results? I ran a few tests and realized that their p values are the same. Does mean ...
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18 views

compare two 2D-datasets

I have measured 7 analytes (chemicals found in blood) from a patient, before and after treatment with some drug. These analytes' levels in blood are affected (increased) by drug treatment. The blood ...
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40 views

Is this simple paired-sample permutation test valid?

I have about 10 pairs of scores, $(x_1, y_1),~ ...,~(x_{10}, y_{10})$, with all $x_i$ and $y_i$ being between 0.0 and 1.0. I'm interested in testing whether the mean difference over pairs is ...
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96 views

Regression analysis for paired data in SAS

I want to analyze paired data using regression analysis to adjust for covariates. I used PROC MIXED statement in SAS and I modeled the difference as the Y in the ...
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10 views

How to compare the change (increase or decrease) for two pairs using one-way Wilcoxon signed-rank test?

Suppose I have $X_{before}$, $X_{after}$ and $Y_{before}$, $Y_{after}$ (before and after the drug). Each variable have 15 observation, i.e 60 in total. I used one-way Wilcoxon signed-rank test to see ...
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15 views

Paired Likert Data - Pairing was lost

I was given some likert type data (5 ordinal response possibilities) from a pre and post assessment so the data is paired. However the pairing of the pre and post data was not kept, so I do not know ...
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81 views

Statistical test for paired data in an r x c contingency table

To perform statistical test on paired data when we have two dichotomous nominal variables (i.e., in a 2 x 2 contingency table) we can use the McNemar's test. When ...
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100 views

ANOVA - Independence condition for paired data

Hi I'm reading the book "OpenIntro Statistics" about ANOVA and in section 5.5.4 when explaining the conditions for applying ANOVA under the voice 'Independence' it states: Independence. [...] For ...
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37 views

Statistical analysis for interaction of genes in multisamples

Say I have 120 human individuals. I have done gene-gene interaction in those individuals and found the frequency of all the interacting genes as shown in the data below. I want to do some analysis to ...
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12 views

Paired test (non-independent) for rank order data

I have responses from a survey with questions where respondents were asked to rank their top 3 choices from a list of 8 choices. An example of the type of question would be to rank their top 3 methods ...
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27 views

Between-subject comparison contains paired data

This is a difficult question to search for, so I apologize if it's been addressed elsewhere. If I am interested in the effect that weather (sunny/rainy) has on dog running speed, and I have running ...
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1answer
26 views

Paired test, unknown sample identites

I have data in which I have repeated measures on samples (at different times), but do not know the identities of the individual samples at each time point. Just for some context, I'm doing behavioral ...
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1answer
37 views

Can a paired t-test be used with the number of words recalled?

I recently went to a 3rd grade level science/math school exhibition, where someone had posted this data on how well people remember words, when they read it in a book vs a tablet. There were in total ...
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10 views

Test for variance homogeneity and dependent samples

I have the following question regarding statistical tests for an fMRI phantom (i.e., roughly speaking a standardized object (e.g. cylinder filled with gel) used to make inference e.g. on properties of ...
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30 views

Difference in Means vs. Mean Difference: Confidence Intervals

This is a follow-up question to Difference in Means vs. Mean Difference. I am, however, interested in the confidence intervals for the difference of the means, and the mean of the paired differences. ...
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10 views

Testing similarity between paired measurements compared to population

Suppose you measure heights from sets of two siblings and want to test if siblings are more similar to each other than to the population as a whole. What would be an appropriate statistical test?
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32 views

Power calculations with a continuous independent variable in a case-control study with pair-matched data

So I have been struggling with this matter quite a while now and still have not found a solution to this problem. In fact similar questions have been asked here before but no answer was provided to my ...
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87 views

Paired t-test and correlation

Say I have $n$ pairs of observations. I can run a paired t-test to test for the significance of the difference in means. I can also look at the coefficient of correlation between the 2 sets of ...
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262 views

Effect size and bootstrapping in paired t-test

I have multiple paired $t$-tests, such as one giving results: $t_{14} = 2.7,\ p = .017$ Although people seem to do effect sizes in different ways in repeated samples, I have taken the mean ...
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52 views

paired t-test, 2 samples of different sizes

I have a population of interest on which one numeric variable has been measured twice: before and after surgery. I did a paired t-test to compare means of the variable. However, there is a difference ...
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29 views

Statistics test for paired data with discrete outcomes

I have pre-post data for several variables and I'm looking to analyze them. The responses to the questions are 0,1,2,3,4 with 4 being best and 0 being worst. For each variable could I simply find the ...
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52 views

Interpreting wording for formulating hypothesis testing

I've been presented with paired data for individuals' weights before and after a dieting program (paired t-test problem). The question being asked is "test the hypothesis that the dieting program is ...
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1answer
108 views

Should I use two-way ANOVA or some kind of paired t-test to compare response to treatment?

I have browsed around and have found mixed partial answers so I decided to give my exact situation and see if you guys could help me (really appreciated). My data has 3 columns: Before treatment (...
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26 views

Mining sequential associations using entropy measures

Assume I have a sequence that looks like this: A-A-A-B-A-A-C-A-A-B-C Let's say I want to predict to use the sequences of letter that occur between one letter and ...
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28 views

Compare between two dependent but not paired samples

I want to compare the mean of two samples. Sample A is for one day and Sample B is for one week. Sample A is a subset of Sample B, that is, the week in Sample B includes the one day in sample A. It is ...
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125 views

Statistical test for one paired observation [duplicate]

In this question, @whuber writes in his reply that If you were willing to assume something about that common distribution (such as it is some Normal distribution--but without knowing or assuming ...
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77 views

Paired design and building a GLM

I am blocking a bit on the choice of a model for my data. The study is applying 2 different stimuli (S1 and S2) on some animals. Each stimuli has two 'treatments': either 'on' or 'off' (off being the ...
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89 views

Computing required sample size for paired t-test

I have some paired t-test data (40 pairs) and I would like to use these data to estimate the sample size required if I were to conduct the study again with a new set of requirements. I'm using ...
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94 views

Testing the difference between multiple paired proportions with different sample sizes

Is there a hypothesis test similar to the paired t-test for testing if the difference between a number of paired proportion estimates is significantly different from zero? The data consists of 2 lists ...
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351 views

What's a good way of graphically representing a very large number of paired datapoints?

In my field the usual way to plot paired data is as a series of thin sloping line segments, overlaying it with the median and CI of the median for the two groups: However, this sort of plot becomes ...