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.

learn more… | top users | synonyms

1
vote
0answers
14 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 ...
1
vote
0answers
20 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
votes
0answers
59 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
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 ...
1
vote
1answer
22 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 ...
0
votes
0answers
22 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
votes
0answers
14 views

Test-retest reliability

I have come across following table in a publication, where r is correlation coefficient. I could not find detailed procedures for test-retest reliability, is it any different from paired t-test ? ...
0
votes
1answer
26 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 ...
2
votes
1answer
81 views

Error in the design of an experiment

Suppose that we have a population with a subpopulation that exhibits a certain characteristic. We are interested in the performance of a group of people from the population on a group test. The ...
1
vote
0answers
28 views

Price comparison statistics and data visualisation

I'm getting into learning statistics and was hoping you could give me some pointers on where to go with this experiment. Basically I'm trying to compare prices for same/similar items across a variety ...
0
votes
0answers
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. ...
9
votes
1answer
117 views

How to choose between sign test and Wilcoxon signed-rank test?

I am trying to pick one from these two tests to analyze paired data. Does anyone know any rules of thumb about which one to pick in general?
0
votes
1answer
26 views

Dependent t-test for matched pairs vs repeated measures

I am planning an evaluation which will deploy pre- and post-tests for one group of students. I would like to perform a dependent t-test but may not be able to perform a repeated measures analysis ...
23
votes
1answer
812 views

Have the reports of the death of the t-test been greatly exaggerated?

Reading through CV all-time classics I came across a statement that I would like to clarify. This is the post and my question refers to the closing remarks: "I have to note that all of the knowledge I ...
0
votes
0answers
18 views

Regression analysis for change in overall score of a likert based survey

We have a pre-post study and we want to assess the effect of an intervention on the change in the scores of a survey in a group of subject. The survey is made up of many likert questions. We will ...
0
votes
0answers
42 views

Nonparametric MANOVA for paired samples

I have a Test group(~ 20 subjects) and Control group (~ 20 subjects) on whom 10 sets of measurements (10 Dependent variables - DV's) exist before treatment. Post treatment (on the Test group) the 10 ...
0
votes
0answers
9 views

Linear regression with different samples of data: addressing compatibility and parameter estimation

I have two samples of data (call 'em black and red), spread like in figure. I ran a linear regression over both samples. I understand that they cannot come from the same joint pdf f(x,y), and that a ...
1
vote
0answers
45 views

Analysis of paired count data

I need to test data on patients in a pre/post setting. I have data on the counts of seizures in a starting interval, and then another count of seizures after the patient was treated for the same time ...
1
vote
1answer
38 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 ...
2
votes
2answers
57 views

Comparing variances of non-normal distributions

I have edited my OP to try and better explain my data and my questions. Background Info I have 34 species, and for each of them I identified "category 1" genes. Their counts are in the vector ...
2
votes
2answers
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 ...
0
votes
0answers
21 views

Paired t-test with pairing based on dates?

I have the conversion rate of 2 pages per day during 30 days. I know that the conversion rate follows a daily trend and that could explain a lot of the variation. I want to check if the difference ...
1
vote
0answers
33 views

How to compare two different rankings of same set of objects?

I have $N$ objects $A_1,\dots,A_N$. I have two algorithms that assign two different scores to each of this objects. Thus sorting on this scores gives me two different rankings of these same objects. ...
2
votes
1answer
19 views

Test to evaluate if two delta values are associated?

I have an observational cohort. Subjects have lost weight. I wish to see if the weight they lost is correlated to an increase in break down of amino acids muscle. I have values from 2 time points ...
1
vote
0answers
32 views

Test for overlap between two sets of hypothesis tests

I'm looking for the appropriate test for determining whether the overlap in variables in which the null hypothesis was rejected is greater than expected by chance for two identical sets of independent ...
0
votes
0answers
20 views

What statistical test should I use? Paired t-test, $\chi^2$ goodness-of-fit or neither?

I am looking to evaluate rate of improvement of PAP results. I have total number of paps completed and of those a number were unsatisfactory for evaluation. I then had an educational session with ...
2
votes
0answers
33 views

Can I run a paired T-Test with two different sample sizes?

I recently ran choice tests for birds, to see if they preferred either food that they have waited for or food that they have not waited for. Each of the 8 birds had 15 tests, so I have 120 choices in ...
0
votes
0answers
36 views

Testing for differences between two treatments with repeated measurements

I am a little uncertain which test / approach to take for the following problem. I am using R. Data I have data from an experiment. The experiment has two different treatments and I ran a total of 5 ...
3
votes
2answers
80 views

Difference between confidence intervals and comparison arrows

I am using the R package lsmeans. On page 10 of the vignette (pdf), a way to show the comparisons between groups is described using: ...
1
vote
0answers
11 views

Pairwise comparison with repitition

I did a test where I have 7 audio systems which where compared with each other and the tester have to say if the second one is better or worse than the first (scale -3 to 3). After comparing all 21 ...
0
votes
1answer
62 views

Wilcoxon signed-rank test for proportion variable response?

My response variable is a proportion. The explanatory variable is categorical with two levels which are not independent. The distribution of the response variable is different from normal. ...
1
vote
0answers
45 views

Paired t-test…?

I want to analyze how the purchasing decision to buy a certified food product can be varied due to an information shock. My sample consists of 200 respondents and the responses were taken as dummies ...
0
votes
0answers
60 views

Why using the Wilcoxon Rank Sum Test instead of any other pairwise statistical test?

I am quite rookie in statistics and I have a simple question to ask. I have to compare pairwise 32 variables, each one with 10 f-measure outputs. I used the Tukey-HSD test and results were quite ...
1
vote
2answers
74 views

Compare two hierarchical trees

I want to measure the similarity between two hierarchical trees generated from the same n objects. The two trees are generated using the same metric at two different instants. Thus, I would like to ...
0
votes
0answers
16 views

Replicating a paired t-test via regression

Setup: I have a survey where subjects had to divide 600 points between two investment opportunities (option A and option B). Thus, I always have invest_A = 600 - invest_B. Goal: Check whether ...
0
votes
0answers
26 views

Which one is better for train data for rank svm - more queries with less documents or less queries with more documents per query?

I am using Rank SVM [https://en.wikipedia.org/wiki/Ranking_SVM , http://research.microsoft.com/en-us/people/hangli/l2r.pdf ] which is based on pairwise approach i.e. the model learns by comparing ...
0
votes
0answers
15 views

Comparing multiple effects of treatment

I am measuring gait in PD patients undergoing surgery. I measure them pre-operation and then at 6 months post-operation. I want to answer the question how does their gait improve. I am reporting 13 ...
0
votes
0answers
14 views

Predict missing tail data in one vector based on complete data of another vector

I have two sets of paired data. The first set is a complete population grouped into 51 ascending groups as follows: ...
1
vote
1answer
212 views

Correct name for waterfall chart with data point pairs showing net value per pair?

The chart illustrated below is an attempt to show a concept I'm looking to visualize. On each day I have two numbers I want to show - an increase (tasks assigned), and a decrease (tasks completed). I ...
1
vote
0answers
61 views

Sample Size for Comparing two Measuring Tools

Let's say I have two devices that measure the same thing: the thickness of an object. Knowing that device 2 is more accurate and precise, I wish to see how accurate device 1 (how close do the readings ...
2
votes
0answers
57 views

How to test two paired probability distributions

I have 50 paired samples, each sample contains the proportion of animals per length category, collected from the same source using either method A (50 samples) or method B (50 samples). Now I would ...
0
votes
0answers
59 views

Multiple Comparisons for paired control and treatment groups

I want to conduct a post-hoc analysis on the impact of a treatment compared to the control Each control and treatment were selected to that the underline features are similar. For e.g. in the ...
1
vote
0answers
48 views

How to deal with different numbers of days in a month for comparison?

My question is very basic, and I'm looking for a conceptual answer. We put about 55000 values (individual deliveries) on a graph. They are sorted by day of the month to see if there's a trend and to ...
3
votes
3answers
86 views

How to find the right test?

I have a problem in medicine: Each patient can have several (3) symptoms (A,B,C) of a disease at the same time. For each symptomtype we can measure a score i.e. A=0.2, B=0.45, C=0.8. The aim is that ...
0
votes
2answers
177 views

Paired two one-sided t-tests (TOST) with unequal sample sizes

I have data from two populations (let's call them "before" and "after"), collected in a paired fashion. That is, I take a measurement under one set of conditions before, and then I can take multiple ...
0
votes
1answer
37 views

What to do with paired data when a minority of pairs have more or less than two members?

Let's say I have two sets of measurements that go on like this: ...
0
votes
1answer
40 views

nested paired tests

I have a design with patients treated with a certain drug.We have patient data before and after taking drug.Within in these patients there is are two types of people , responders and non responders in ...
1
vote
0answers
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+]. ...
2
votes
1answer
90 views

How to properly plot paired data when you have more than two groups

I have a question which seems to be very elemental but I have found lot of disagreement about it. I have a situation where we took several measurements of the same individuals. I was suggested to ...
2
votes
1answer
43 views

Dependent or Independent samples? I cant decide! Help

I'm confused i have assignment where i have to determine if the samples are dependent or independent. The sample is of 100 people, where their reaction times from their dominate and non-dominate hands ...