methods for comparison when the measurements to be compared are used each on the same subjects, so for each subject we get a pair of measurements.

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1answer
22 views

Is it possible to conduct ANOVA on paired samples

I have data similar to that (fake values): | Individual | Profession | Software_A | Software_B | |------------|-------------|------------|------------| | A | Teacher | 4.5 | ...
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0answers
8 views

How to compare ordinal variables across groups and time?

I have a short survey that is administered twice (baseline and follow-up, same questions) to a treatment and comparison group. It contains mainly ordinal variables. Here is one example: Overall, how ...
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0answers
12 views

Test for multiple measures on (multiple) paired groups (with multiple variable?)

I read this: Paired t-test when each data point was repeatedly measured different number of times? but it is different from my case. I have to compare the effect of some molecule on cell survival. I ...
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0answers
9 views

Pairwise comparison among variance

I would greatly appreciate any help on this! I'm doing a research where I need to compare variances (or standard deviation) of several samples (9 samples). I did some research and found the "Bartlett ...
0
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1answer
29 views

How to test multiple comparisons of means of variables in R

I have a multiple N (>20) variables. I want to test $H_0$ that in at least one pair of them one variable have significantly higher values then the other. I know that I can perform a bunch of $\frac{...
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0answers
25 views

How to describe this model

I have a study where subjects have received treatment to one eye, the other eye is untreated and is acting as a control. There are 3 measures (of retinal thickness) taken in each eye. The model I am ...
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0answers
22 views

Comparison of 2 groups of patients

The woman, aged 62, was diagnosed with breast cancer using a standard diagnostic method (say mammography). Standard treatment was launched. Unfortunately, the patient died after 4 years, at the age of ...
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0answers
10 views

Applying Friedman Test on percentage of binary outcome

Is it correct to analyse data as described in the following? N Participants were asked to watch different videos showing the outline of a hand grasping an object. Four different types of hands were ...
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0answers
98 views

How to find the maximum number of independent pairwise comparisons between groups

I have the following situation: Consider a dataset that is comprised of a number of factor levels x = gl(5,1) > [1] 1 2 3 4 5 > Levels: 1 2 3 4 5 I want to ...
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2answers
37 views

Which test should I use to compare the means of two factors (motivations), which were surveyed at one time, of one sample?

I conducted the Academic Motivation Scale. This instrument returned three types of motivations, namely extrinsic, intrinsic and amotivation. The latter motivations means the absence of motivation ...
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4 views

Comparing set of counts with different n sample and many zeros.

I had a look of may treats and find different pieces here and there but I cant figure out how to do this "simple" comparison. I have 2 counts (obtained with different methods but assuming from same ...
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0answers
12 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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7 views

Comparing two matched data sets

I have two matched data sets, $A$ and $B$, and I know that $B=a\cdot A$, where $a$ is some constant. Is there a test that would say that $A$ and $B$ have basically equal distribution, just shifted? ...
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0answers
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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0answers
20 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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0answers
9 views

How to assess the significant level of a sample difference per number of element

I have 3 samples of 28 paired elements which have been tested for normality and they are not normal due to biomodal distributions. I carried out a Friedman test and is not significant. However I know ...
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0answers
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 ...
0
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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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1answer
35 views

Alternative to Wilcoxon signed-rank test with sample size < 6

I have to make a statistical analysis of only four (n=4) data pairs. I have tested two specific warm-ups for 4000m Team Pursuit in track cycling, and used a 250 m. sprint test as a meassurement of the ...
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0answers
13 views

Non-parametric paired data: several Wilcoxon signed-rank tests? Other?

Scenario: I've taken blood samples from a group of patients (n = 15) and measured the expression of one marker on three cell populations within each sample (transitional B, naive B, memory B). I'm ...
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2answers
31 views

I'm looking to compare if there is a significant difference between pre-treatment and post-treatment values

3 sites are sampled pre-tx, and the same 3 sites post-tx. I am trying to compare the number of cocci in site 1,2,3 pre and post tx (refer to table) But the issue is i've recorded my values in ranges (...
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0answers
5 views

How to take into account measurements of out-of-bound cases in a statistical pair-wise comparison?

I am doing simulations of different algorithms, and I compare them using the number of steps they need to reach their goal. To prevent the algorithms from running too long I put a maximum of 500 steps....
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0answers
6 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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0answers
18 views

testing multiple paired ordinal measures

Please give me advice on a robust way to evaluate multiple ordinal measures. I have a group of n subjects who have a treatment for spasticity (abnormal muscle stiffness). A measure of spasticity is ...
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1answer
58 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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1answer
33 views

Pairwise comparison with Bradley-Terry

I am performing a pairwise comparison test for the perceived weight of objects. I want to estimate the difference between each pair, say, A - B. I suspect that the underlying distributions of A, and B,...
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0answers
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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1answer
121 views

Can a paired t-test test if the difference between two means is less than a specific value?

In paired t-tests we test if the difference in means if 0 (or another value). I'm wondering if it's possible to instead test if the difference is less than x?
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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....
4
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1answer
48 views

I have 12 items to get into a single rank order. Can I get this from having a few hundred people see a set of 10 of the possible pairs of items?

I attempted to run a study where people had to rank order 12 statements from best to worst. However, it was extremely messy and difficult for people to rank that many items. Now, my professor and I ...
0
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1answer
49 views

Matched data: Paired t-test vs. indpendent

Suppose I have a group(X) of people receiving a treatment for high blood pressure. Suppose I match these people to controls(Y) who have high blood pressure but who are not receiving any treatment. I ...
2
votes
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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0answers
8 views

Compute average pairwise correlation Y(X1) vs Y (X2) within many nonoverlapping intervals of variable X

I am pretty sure someone already solved this problem and shared the code. Could you please help to find it? I need to calculate the pairwise correlation for the values of a discrete function Y(X) ...
3
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0answers
31 views

Is the Wilcoxon Rank-sum test the best option with many near 0 values >0?

I have a two very large datasets. They look something like this, but with a few thousand rows. They are the total number of tyrosines in a short DNA sequence with a length of up to 5. A would precede ...
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0answers
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 ...
3
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0answers
68 views

Paired comparison of instruments using different measurement samples

I have instruments A, B, C and D - I'm in search of the best one. The problem: For illustrative purposes, let's use an example of evaluating the best among the instruments measuring difference in ...
1
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1answer
110 views

Looking for the right statistical test. - Wilcoxon signed-rank test?

I'd like to test if three data sets are statistically similar, but I'm not sure which test is the right one (because the examples on the internet are all very simple). I start with a list of values (1 ...
0
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0answers
14 views

Best possible statistical approach to compare n pair of variables along a set of genomic intervals

I am dealing a bioinformatics problem and need help in approaching it in the right direction. I have a set of variables that represent different kinds of genomic data and are real valued. I am trying ...
0
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0answers
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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0answers
41 views

Compare two sets of correlations

I have two sets of pairs: <distance, correlation> where the correlation is the Pearson coefficient between two samples, ...
1
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1answer
25 views

How to compare two sets of time-series 3-Dimensional data?

Let us say we have two data sets. Each of the data sets has velocity $(v_x,v_y,v_z)$ and acceleration $(a_x,a_y,a_z)$ of particles at time steps n where $0 \leq n \leq 100,000$. Now how do I compare ...
0
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0answers
31 views

Calculate r from paired-samples t-test or from repeated-measures ANOVA?

Is it possible to calculate a correlation coefficient (r) from F- or t-statistics in the case of paired samples? The bottom comment on this page seems to suggest that you would calculate it in the ...
1
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1answer
37 views

Paired sample t test

I have developed an Interactive Genetic Algorithm for my thesis and I need to find out if the mean population fitness at generation 5 is significantly different from the mean fitness at generation 10. ...
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0answers
17 views

Comparing corpuses with different vocabulary?

How can we compare two corpuses with different vocabulary? Basically, we have a bunch of distributions for different vocabularies that we want to compare. But all the vocabularies are different ...
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0answers
37 views

Crossover study, multiple measure

I'm trying to analyze data from a crossover study, where two treatments ($A$ and $B$) are applied to $n$ patients (each patient receive both treatments). For each treatment I have an outcome with ...
0
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0answers
106 views

Paired t-test vs Wilcoxon signed rank

I conducted a pilot study (n=14) which was evaluated retrospectively. I have four parameters with a pre-intervention and post-intervention score that I want to compare. I am wondering whether I can do ...
1
vote
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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1answer
62 views

Effect size (cohen's d) when mean and SD are zero

I am calculating effect sizes (Cohen's d) for a meta-analysis to examine pre-test to post-test differences after receiving a word-learning treatment. I am using pre-test and post-test means and SDs in ...
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0answers
52 views

How to compare means of two sets when one set is a subset of another and the sample sizes are not

I have two samples containing citation counts for some publications. Of those samples one is a subset of the another. That is, subset contains some exact citation counts appearing on the other sample. ...
0
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1answer
33 views

Degree of Freedom twice as much as it should be?

I am performing paired t-test as following: t.test(h1$pureinf_hvar, h1$pureinf_lvar, alternative="greater", Paired=T) having each column of h1 (pureinf_hvar and ...