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 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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18 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
30 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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7 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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15 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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9 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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23 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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1answer
54 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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1answer
149 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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1answer
37 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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20 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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41 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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37 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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30 views

Stuart Maxwell on 3x3 contingency table or collapsing of 3x3 to 2x2 for McNemar

I have a 3x3 table of paired data (current,former,never) which is compatible with the Stuart-Maxwell or even the Bhapkar test but all of the studies I've seen working with similar data collapse the ...
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17 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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26 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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38 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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1answer
82 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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58 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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225 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 ...
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13 views

compare data for self, ideal self and imagined self

I'm trying to compare data for an actual, ideal and imagined self, data was obtained by asking participants to fill out a BFI questionnaire three times, once for each self. The more I think about ...
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42 views

How can I find out the needed sample size

I'm going to study if medical reconciliation diminishes the amount of inappropriate medications amongst elderly people in a small part of Sweden. I will count the number of inappropriate medications ...
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47 views

Comparing logistic regression models with paired data, population-averaged estimates and robust standard errors

I would like to ask if any of you have suggestions for comparing logistic regression models with paired data (3 observations/ID code), population-averaged estimates and robust standard errors (I am ...
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47 views

Overlapping or sliding interval matching

So I want to conduct a matched case-control study. One of the variables I want to match on is continuous variable, lets say age. I have converted this to categorical variable [17-19],[20-36],[37+]. ...
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840 views

Difference in Means vs. Mean Difference

When studying two independent samples means, we are told we are looking at the "difference of two means". This means we take the mean from population 1 ($\bar y_1$) and subtract from it the mean from ...
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42 views

What is a paired observation or paired variable?

The question kind of asks itself, can anyone explain what a paired observation or paired variable is in basic terms? My data consist of the number of words learnt in a week for 19 different ...
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495 views

Fisher exact test on paired data

Given $40$ cases with lung cancer and $40$ matched controls (without lung cancer) (matching based on age, sex, etc.). To try to find evidence between the effect of smoking on lung cancer, I used ...
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72 views

Comparing paired data in two different treatment groups

Suppose I have two groups of participants. The first groups gets treatment 1 and the second group gets treatment 2. The first treatment is a standard treatment and the second treatment is something ...
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35 views

Repeated Observations Due to Pairings in Logistic Regression

I have data with repeated observations within a given year. Here's a snippet of the data: ...
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19 views

Analysing matched pre post surveys that have definite answers

I have pre - post matched survey data that contains True/False responses and Multiple Choice responses. These questions have definitive answers, it is not a Likert scale. How can I compare the ...
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1answer
84 views

Is the significance of difference in slopes equivalent to the significance of the slope of the difference of two series?

Say you have an independent variable, $x$, and two dependent variables $y_1$ and $y_2$. I want to calculate whether these two variables have a significantly different slope. I can do it by calculating ...
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2answers
402 views

Mann-Whitney U test and paired data

I've read that working with paired data requires other method than Mann-Whitney $U$ test. I am not sure about how formally accurate is this statement. Reasons: Suppose that there is a set of $n$ ...
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34 views

Test for paired right censored data

I have a paired right censored data eg. ...
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31 views

Estimating distribution from pairwise comparisons (crowdsourced)

I would like to estimate a discrete probability distribution, for instance, occurrences of animal species in a geographical area (e.g. from all the animals 20% are bears, 10% are wolfs, 5% are ...
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31 views

Other statistical tests for paired data

Are there other statistical tests available to compare paired sets of data e.g. {1, 2, 2, 3, 4} v's {3, 3, 3, 2, 5} for similarity, aside from the paired Wilcoxon and paired Student t-test?
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44 views

paired t-test for pairs each having more than one sample

I have a large and a small data set (the small data set is a subset of the large data set) with 2 columns(lets say var1 and var2). Now, based on var1 in the data set, I have sorted the large data set ...
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159 views

Comparing data that has been recorded on two devices

I have two data loggers which are recording a physiological signal. Device A is a system that has been in place for many years, and records data ~once/minute. Device B is a prototype device which ...
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28 views

Perceptual Agreement Statistics - Test for similarity between pairs?

I'm struggling to identify if there is a suitable and established test for determining if pairs formed from two separate populations are statistically similar when multiple people attempt to match ...
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96 views

ANOVA of pairwise (non-independent) data in R

I am trying to do a one-way ANOVA of data that is generated from pairwise comparisons, and am having difficulty resolving the problem of non-independence. I have 12 populations, and for each pairwise ...
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88 views

Am I using Paired Statistical Test Correctly?

I am comparing a feature between correct & incorrect trials. There are N=1194 paired samples $\{x_i,y_i| i=1,2,...N\}$, where x is for correct trials and y is incorrect trials. I am using a ...
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62 views

Test if paired data are more similar than non-paired data

I have a set of ten samples, comprised of five pairs of twins, and I have calculated the pairwise distances between all ten samples. The question I would like to answer with this data is: Are ...
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39 views

Statistic for measuring amount of “reordering” between two vectors?

Ok, so here's the motivating situation: I have two pieces of software for which I can feed in an RNA sequence, and get out a numerical value. And while it's clear that one of the pieces of software ...
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2answers
221 views

Is paired t test sufficient to show the two data sets are similar

Let me give the details of my problem setting, we have a learning algorithm that can take a collection of algebra problems and automatically generate similar ones. Of course, an important question to ...
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26 views

Paired data with independent groups of treatment, how to plan and analyze?

I need your assistance, I am trying to design an experiment, and in order to do so I need to know how the data will be analyzed. The experiment in on rats. Each rat gets some treatment, and a measure ...
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1answer
838 views

ANOVA for paired data

I'm asking just of curiosity. If I have, for example, paired data and 3 groups (for example, baseline, 1 week, 2 weeks of treatment: I mean we take some samples at the baseline, then we apply some ...
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0answers
41 views

Test for pairs of small integers

I have two classifiers, say $A$ and $B$ and I am performing 10$\times$10-fold cross-validation on them and record the number of instances correctly classified from the test set. Unfortunately, the ...
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1answer
208 views

Bias-variance tradeoff in the paired t-test

Suppose we have $K$ subjects and a treatment with two levels, "Before" and "After". A paired t-test is equivalent to fitting a fixed effects ANOVA: $Y = Subject + Treatment +\epsilon$ It is also ...