Linked Questions

1
vote
1answer
512 views

Paired t-test for repeated measurements, but with 2 missing samples. [duplicate]

I am doing a gene expression analysis on blood samples collected from the same 8 goats. My sampling points are before LPS-treatment (0h), and 1h, 2h, 5h and 24h after treatment. I want to compare the ...
1
vote
1answer
208 views

paired t-test, 2 samples of different sizes [duplicate]

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 ...
1
vote
0answers
178 views

paired or unpaired t-test [duplicate]

We are polling respondents every month and asking a couple of questions about the number of times they eat certain foods. We have significant loss to follow up every month but generally retain 20% - ...
0
votes
1answer
123 views

Mix of paired and independent data analysis [duplicate]

Is there any data analysis that can be performed on both paired and independent data? For example, we have scores on a questionnaire for individuals who were exposed and not exposed (control) to a ...
1
vote
0answers
105 views

Pre and Post intervention with no pairing [duplicate]

My sample size is small (n= 28). I have 2 cohorts who have carried out the same interventions at different times. I have collected pre and post intervention scales for both groups. What I have not ...
2
votes
0answers
84 views

comparing means for two groups with some overlap [duplicate]

How can I compare the means of two data sets where there is some overlap in the samples so that the groups are neither paired nor independent? That is there has been some change in the samples with ...
3
votes
0answers
69 views

How to analyse paired data lacking pairing information? [duplicate]

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 ...
0
votes
0answers
25 views

Can Independent T-test be performed on data obtained on same people by 2 different investigator? [duplicate]

I am stuck with this question and a reasonable answer will be well appreciated. Suppose a numerical data is obtained from the same people by two different investigators. However, we could not link ...
12
votes
3answers
2k views

Maximum likelihood estimator of joint distribution given only marginal counts

Let $p_{x,y}$ be a joint distribution of two categorical variables $X,Y$, with $x,y\in\{1,\ldots,K\}$. Say $n$ samples were drawn from this distribution, but we are only given the marginal counts, ...
2
votes
2answers
10k views

How to do a paired test when some cases have no pair? [closed]

I have a question regarding paired and unpaired tests. I know the difference between both tests. I am using R for Wilcoxon test. My test is a paired test, however the X and Y do not have the same ...
1
vote
3answers
3k views

Pre/Post Likert survey analysis

Online anonymous Likert survey was sent containing 13 items, the survey was sent before and after an intervention. I would like to analyze the % respondents who responded agree/strongly agree to the ...
4
votes
1answer
2k views

Methods for comparing proportions in partially overlapping samples

We conducted 2 similar surveys in parallel to a group of health care facilities. One was sent to managers, one to staff. Some questions were identical, others asked about different areas of the ...
4
votes
2answers
801 views

Analysing pre-and-post intervention study with anonymous responses

The study I am analysing is a pre-and-post intervention questionnaire of students' views before and after studying a module. The questionnaire was distributed in three different geographical ...
2
votes
1answer
567 views

Paired Proportion Test

Like a paired t-test is there way to approach a paired proportion test? Here is the situation: Say I have a Website "A" and Conversion Rate, assume 2% out of 1000 sessions, and we perform some ...
4
votes
1answer
285 views

Can an independent t-test be used on paired data when the pairing is unknown?

Suppose the effectiveness of a training course is examined, and performance of each individual in a group is taken both before and after, and the differences are compared in a paired $t$-test. Would ...

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