# paired t-test

1. ### Should I use Bonferroni correction?

Hi. I‘m analzying the influence of Yoga on stress adadption and work related stress. I tested the differences of work related stress between pretest and posttest in the experimental group by a paired t-test. I also tested the differences of stress adaption between pretest and posttest in the...
2. ### Which approach to evaluate small spatial variations in temperature?

I am evaluating whether utility-scale solar energy plants affect the surrounding climate (initially temperature). An effect has been found in one paper using the approach described below/attached but when repeating this approach I find no effect for the same site. I want to be sure that there...
3. ### Lilliefors test for paired series + Bonferroni correction

Hi all, I got two series where I want to find out if they differ. The two series are paired meaning they are values for the same subjects. N = 21 After: 0.87348565, 0.88276705, 0.89083918, 0.89520159, 0.89519151, 0.90286579, 0.90586482, 0.90750014, 0.90978787, 0.91008748, 0.91230162...
4. ### Testing mean difference on group means, multiple independent groups/sites

Hello Talk Stats group, I am trying to find out what statistical tests to run on a set of aggregate data (no individual data) on 3 different groups. My variables are summarized below (but I aam attaching a random example to make it more clear): Group 1 in site 1: Mean value (blood sugar)...
5. ### Paired T Test ???

Hi I am trying to work out which statistical test to use to determine whether there is a relationship between visual acuity (how small letters on a letter chart are) and contrast (how dark the letters are). I have used one sample of participants and tested both visual acuity and contrast on...
6. ### [SPSS - wilcoxon/paired t test] - not normally distributed data

Hello! I ran an analysis of my data of research into a repeated measures design and found the difference of both conditions to be not normally distributed. When exlcuding data to make it normally distributed and thus use parametric tests, can we only exclude data that exceeds the limit of...
7. ### Repeated t-tests or ANOVA for discerning difference between two treatments

Hello, I am helping my sister with some statistics in her master's dissertation in behavorial/social sciences. I have studied a couple of courses on statistics/probability, but my proficiency could certainly be better. I have this book "An Introduction to Mathematical Statistics and it's...

Hey everyone, I've been trying to confirm this for a while but I haven't been able to find a conclusive answer. I'm guessing the answer is pretty simple but I'm a bit rusty and I've looked over it so many times that I'm now a little bit saturated. Basically I am doing a project on bladder...

10. ### Comparing affected sides instead of just left and right.

Hi. I'm relatively new to statistics and SPSS. I've been testing the shoulder strength of 200 shoulder patients divided into two groups. I've been testing both of their shoulders, so I could have a reference value. I would like to compare the affected shoulder of group 1 to the...
11. ### How to test dependent means with unequal sample size? Weighted Paired T-test?

Does a Weighted Paired T-test exist? I am comparing the percent of a population that are juvenile between 'Autumn' and 'Spring' at many sites. The Sample size (n) is variable among the sites and between the seasons. Sample data: Site___Fall %__n_____Spring %__n...
12. ### One-way anova or paired t-test on intervention study? OR BOTH?

Hi all. I'm planning a study where I get 3 separate groups of people, make them all do a satisfaction questionnaire, then give each group one different intervention (i.e. 3 different interventions total) and then get everyone to do the same satisfaction questionnaire again after the...
13. ### Age and DNA methylation data: HELP NEEDED

I have data on patient Age as well as change in % DNA methylation levels for promotor regions. I seek to understand the impact of Age on the % change in DNA methylation levels. What is the best way to do this? Paired t-test of Age vs % change in DNA methylation data yields ridiculously high...
14. ### Paired bootstrapping

Hey everyone! Absolute newbie to R, would appreciate help with a question I have been struggling with. Let's say I want to test the efficacy of a medicine in reducing blood pressure. So I have a paired sample . Three vectors are created in r. Before <-c(129,135,145,89,70) and after...
15. ### paired t-test or repeated measurments ANOVA

Hello Given a group where you run 2 models to obtain a parameter, and the goal is to compare both parameters. But not all individuals tested in one group are tested in another, so there is some variance. If using a paired t-test you execute an F-test to see if the variance is acceptable...
16. ### Inference from sample splits when coefficients are not significant (Panel Data)

Hi, I’m new to this forum and have got a little stata problem. Status Quo: I use panel data and a fixed effects model. My independent variable is negative and statistically significant over the whole sample. To test a theory I split the sample in two halves (A+B). Theory predicts...