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

0
votes
1answer
15 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
21 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
33 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
37 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
15 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
7 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
14 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
12 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: ...
0
votes
1answer
103 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
39 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
42 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
22 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
30 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
75 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
1answer
96 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
35 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
28 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
37 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
66 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
35 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 ...
4
votes
1answer
71 views

Difference or proportional

A report was claiming that older individuals were not appreciated at technology firms. They studied a dozen factory locations of a tech firm where employees could (anonymously) suggest process ...
0
votes
1answer
49 views

Poisson distribution with glmer - pairwise comparisons

I am analyzing counting data from a field experiment using the glmer procedure according to a Poisson distribution. The model works and I can visualize the results ...
3
votes
1answer
236 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 ...
0
votes
0answers
40 views

convert 20 category problem into a set of pairwise classifcations

i am struggling to convert a 20 category problem into a set of pairwise classifications. I have separated the categories into 4 classes and calculated the size of the set to be 60. Total = (k-1) x n ...
1
vote
2answers
35 views

How to show that the condition of one hand predicts the condition of the other hand

I have this kind of data: subject hand condition s01 left 1 s01 right 0 s02 left 2 s02 right 2 .. .. .. ...
1
vote
0answers
39 views

Find meaningful next comparison for total ranking on the fly

I want to obtain a total ranking from pairwise binary comparisons. For this, I can use algorithms like Balanced Rank Estimation or Bradley-Terry Model. However, I wonder if you need fewer comparisons, ...
0
votes
1answer
14 views

How to get common language effect size (CLES) with paired groups

Common language effect size (CLES : https://en.wikipedia.org/wiki/Effect_size#Common_language_effect_size) is calculated as proportion of all possible pairs of 2 group values which are more for one ...
0
votes
0answers
35 views

Confounding factor in cross-validation

I have been exploring a dataset using support vector machines. I am solving a binary classification problem and using stratified K-fold cross-validation for performance estimation (the SVM ...
3
votes
1answer
28 views

Missing data paired samples t-test

I have a list of insurance policies that filed claims in pre/post periods. I am trying to test whether the average cost of insurance claims per policy varied. Some of my policies don't have any claims ...
0
votes
0answers
70 views

EMMEANS Pairwise Comparison OR Post Hoc Multiple Comparison?

I was running a 2-way Univariate ANOVA, and there are two tables in the results that compair the 3 levels of one of my IVs (Transformation_Model). Under Estimated Marginal Means, the table is titled ...
0
votes
0answers
15 views

How do I compare a new method of statistical sampling with an established one?

Lets say that: There exist 10 countries. I travel to each country and take a random subset of the population of that country and count how many of my subset are woman. I make a table of country to ...
1
vote
0answers
25 views

Repeated Measures ANOVA?

I am an undergraduate student studying psychology using SPSS to analyse my data. I have 2 conditions of the IV of treatment (treatment or no treatment) to test pain tolerance levels which is measured ...
2
votes
2answers
36 views

Is it acceptable to use a paired t-test to compare my drug dosage data?

I have a table of patient demographics like height, weight, and some lab values, as well as data on the doses of a drug that the patients received. Using the patient demographic data, I also used a ...
0
votes
0answers
35 views

Second Opinion(s) Requested: Doing 6 A/B Tests on a website with confidence levels around .8-92 is a bad idea, right?

A consultant recently used 6 A/B tests to compare the effects of various modifications to a website. The website is designed to prompt visitors to respond with an action. As a "control" for each test, ...
3
votes
1answer
29 views
0
votes
0answers
51 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 ...
4
votes
2answers
160 views

Computing Paired Samples (pre/post) Effect Size with Limited Information

I'm conducting a meta-analysis using the Hedge's g effect size statistic. Many of the studies are only reporting: pre-treatment mean score pre-treatment standard deviation post-treatment mean score ...
0
votes
0answers
15 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 ...
2
votes
1answer
101 views

How can a paired test less powerful than unpaired test?

I'm using wilcox.test to compare two timepoints as such: a <- c(1,2,3,4,5) b <- c(2,3,4,5,6) wilcox.test(a, b) The ...
1
vote
0answers
29 views

How does a discordance test work?

Could someone explain how the discordance test works (and what it actually is)? The explanations I found online are unclear: [...] the concordance test can be viewed as the evaluation of the ...
0
votes
0answers
40 views

Consistent weight.matrix from the GenMatch (Matching package) in R

So I want to use the GenMatch function to generate optimal weight coefficients, to later use in the Match() function. But when I run the command twice, I do not get the same Matrix values. For ...
2
votes
3answers
93 views

How to measure the “confidence” that one set of values is greater than another?

I have a relatively simple task. I have collected several hundred samples from several groups (group here is arbitrary and not relevant to my question). These samples are scored on a continuous ...
0
votes
1answer
16 views

How should I present paired sample test results? [closed]

I conducted a paired sample t-test on pre and post questionnaire results. What should I be reporting?
2
votes
1answer
36 views

Regression Model for Binary Matched or Paired Contingency Table Results

This is a follow-up question on a prior thread about the same setup as follows: We have two "Methods" ("A" and "B") to diagnose a medical condition. We are not trying to determine which one is better ...
0
votes
0answers
40 views

pair-wise comparison for two sets of data where each point contains multiple values

I have two sets of data of the same subjects with 8 time points in each set.The second set is a repeated measure of the same 5 subjects. There are 5 subjects polled per time point. Is it correct to do ...
2
votes
1answer
45 views

Paired permuted t-tests?

I have a small dataset which are not normally distributed. I would like to perform a pairwise analysis of the differences in values between two groups. It has been suggested that I use permuted ...
3
votes
2answers
196 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 $n$ ...
3
votes
0answers
54 views

Does conditional logistic regression effectively “throw away” concordant pairs like McNemar's test?

We are interested in analyzing pre-post data from a randomized control trial. The outcome is binary and I am trying to explain the heuristics of the model formulation for conditional logistic ...
0
votes
0answers
50 views

How to determine correct statistical test for repeated measures, differing treatments in same subject experiment

Our hypothesis is that treatment 1 changes our outcome measure by some amount, and that treatment 1 combined with treatment 2 changes our outcome measure by a larger amount. For each subject, the ...
1
vote
0answers
40 views

Which significance test can be used in this instance? - paired, non-normal means

I have a data set of behaviours for a herd of captive elephants which I have attempted to quantify to compare for statistical significance, i.e., if a behaviour is performed once during an observation ...