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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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 ...
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0answers
11 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: ...
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1answer
96 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 ...
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0answers
34 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
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0answers
39 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 ...
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0answers
16 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 ...
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0answers
24 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
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3answers
70 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 ...
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1answer
64 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 ...
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1answer
32 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: ...
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1answer
23 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 ...
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0answers
33 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
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1answer
57 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
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1answer
32 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
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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
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1answer
47 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
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1answer
199 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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0answers
39 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 ...
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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 .. .. .. ...
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0answers
36 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
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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 ...
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0answers
30 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 ...
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0answers
55 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 ...
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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 ...
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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
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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 ...
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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
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1answer
29 views
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50 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
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1answer
117 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 ...
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0answers
10 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
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1answer
92 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 ...
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0answers
26 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 ...
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0answers
39 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
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3answers
87 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 ...
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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
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1answer
35 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
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0answers
31 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
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1answer
41 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
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2answers
169 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
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0answers
47 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 ...
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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 ...
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38 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 ...
0
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0answers
39 views

Calculating unreported confidence intervals of ratios of paired means without raw data

I am brand new to this site and need some help in analysing some data in a systematic review I'm working on. I want to calculate the 95% confidence interval for the ratio of two means estimated from ...
2
votes
1answer
102 views

Permutation test: when the null hypothesis is **non**-equivalence of two models/predictors [closed]

Suppose I have two models $M_1$ and $M_2$ and I want to compare their performances in terms of measure (accuracy on classification instances, i.e. number of correct predictions to size of all ...
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0answers
25 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 ...
0
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0answers
50 views

Comparison of Non-Stationary Time Series Trends

I am trying to compare two readings of the same occurrences from two different sources, forming two time series. I would like to assign a metric to their similarity/dissimilarity, but the method I am ...
1
vote
1answer
36 views

Compare cumulative distribution functions of several function point counters

Function point counters are used to measure the size of software. However, they are believed not to deliver exact results. Different measurements sometimes produce different results. The performance ...
1
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1answer
31 views

Measure linear relationships between various variables

Different evaluation techniques were used to assess student’s programming ability in an introductory course (e.g. tests, practical exercises, final exam). Which statistical methods could be used to ...