paired data

  1. A

    paired duos data with exclosure cages

    Hi, ( I'm French sorry if english bad) I need help on how treat my data. For 12 weeks i have followed grass hight for 4 grassland (ABCD) . With 1 mesurement per week per grassland. In each grassland, i have placed exclosure cage so animals cannot eat grass. for each grassland : - A : 9...
  2. A

    3 Datasets Hypothesis testing

    n = 72 subjects were randomised to 3 treatment groups: A, B, C, so that n = 26 for Group A, n = 29 for Group B, n = 17 for Group C. Measurements were taken before and after treatment. The differences were calculated between the before & after-treatment observations for the 3 treatment groups...
  3. F

    How do you analyse Likert data for four paired groups?

    I asked a group of 90 people the same four questions about four different artworks. The group viewed the four artworks in-situ in a gallery setting experiencing the artworks one after the other in the same order. Each of the four questions asked was a Likert item, designed to form a Likert...
  4. G

    Multi-level paired data: mutliple linear model or linear-mixed-effects model? or other? (with R software)

    Hello I have a stats thinking about how to best analyse my data. I have sampled forest floor samples in 10 sites, 1 sample per site. In each sample, I quantified the density of 5 different bacteria strains. I want to know if one bacteria strain is more represented on average than others, and...
  5. S

    Paired variables?

    In our research on apprenticeships in early modern times, we have a series of observations (cases), each with several variables. Each observation is unique because of its combination of the variables "student name" and "starting date of the apprenticeship" (a certain "student name" can occur in...
  6. Y

    Paired analysis/ Stuart-Maxwell test

    Hi everyone, I am performing a paired analysis, cases paired with controls, with each individual having a status of current,former or never. I initially performed the Stuart-Maxwell test to determine if there was a significant difference between the proportions of possible paired statuses...
  7. B

    “CFINDER” output data importation and calculation of mean of pairs

    Hi, I face a problem: I have to import a text file (from_soft.txt, which is output from "CFINDER" software). It looks like this: [...]CFINDER_output/from_soft: # text-text-text-text-text-text-text-text-text-text- # text-text-text-text-text-text-text-text-text-text- #...
  8. I

    Paired or unpaired data and questions about test with >2 groups

    Hi guys! I am here for some help with my statistics. I am currently working on a small project involving the expression of surface markers on cells in donated blood from different individuals. Basically, for each individual, I will keep a part of the blood untreated and apply two different...
  9. F

    How to calculate the confidence interval of the ratio of two means (paired data)

    Hi there, I am writing a systematic review and need to calculate the 95% confidence intervals of the ratio of means from whatever the clinical trials I'm reviewing give me. The problem is: none of the studies actually report this information, and all I am given usually is the mean...
  10. C

    Computing the test statistic: Not sure which Formula I need

    Not sure which formula to use... A Health and Fitness company would like to determine if a new product improves cardiovascular fitness. A sample of 20 new customers agreed to take a treadmill test before and after using the product. The test measured how long they could run on the treadmill...
  11. K

    How do do linear regression on paired/matched data?

    I'm helping with a study that is looking at gestational cytokine levels of children with neurodevelopmental disorders versus neurotypical children. I've been given a dataset looking at sibling pairs - one has a neurodevelopmental disorder, the other is neurotypical, and we have gestational...
  12. K

    Paired sibling data

    I'm helping with a study that is looking at gestational cytokine levels of children with neurodevelopmental disorders versus neurotypical children. I've been given a dataset looking at sibling pairs - one has a neurodevelopmental disorder, the other is neurotypical, and we have gestational...
  13. M

    Cox Proportional Hazards Regression

    Hi, I am hoping someone can help me with which model (frailty, strata or cluster) I should use for my data. I have paired data so I need to take that into account when modelling the Cox PH Regression and am unsure which model will give me a more accurate result. My study was looking at the...