pre-post

  1. R

    Which test to use?

    Hello I want to analyse some test score data from a group of students that was measured at two different time points. The results of the test are continuous. And I want to see whether the results improved compared to the first reading. I have a number of other variables that I want to control...
  2. M

    How to analyse data when subjects received both control and experimental condition?

    Dear all, I hope to get some suggestions on how to analyse the data from an experiment I recently ran. My question is whether a new treatment has a positive effect on some or all of 4 dependent variables. 80 subjects participated in one of two versions of our experiment: pre-test > experimental...
  3. J

    Paired Samples T test or Repeated Measures ANOVA?

    Hi everyone, I am on a tight deadline and could use some input on my proposed analyses for my project. PROJECT: I am administering a novel treatment to participants and seeing if they lose weight at the end of 6 months of treatment. There is no control group (there are rationale for this...
  4. R

    Assessing change using McNemar's test

    I have Pre and post-intervention test scores of a number of skills rated from 0-3 (0 = Poor, 1 = Fair, 2 = Average, 3 = Good) for 5 participants. I am trying to use McNemar's test for each skill to test for change and would greatly appreciate some help. I am unclear about whether - 1) I can...
  5. A

    Therapeutic Outcomes for a single group at 3 time points

    Hi, I would be very grateful for some advice because I am getting really confused! I have been collecting outcomes data (3 different questionnaires with likert scales) for a therapeutic intervention at 3 time points: referral, year 2 and year 3 (discharge). It is a single group (n=400) with...
  6. T

    quasi-dependent sample t-test

    Hello all, I am doing a pre-post analysis of adherence to clinical measures. My pre and post groups have some identical individuals, but some different individuals. For example, I am measureing adherence to doctors orders pre-and post intervention. Patient 1 may be in the sample...
  7. E

    Standard deviation of the mean difference out of Pre/Post Test Descriptive Statistics

    I have several RCT pre/post intervention studies that I am calculating Hedge's g for. All of the studies report the difference of mean and difference of standard deviation between pre/post for each group except one. I know how to calculate the difference of mean [= Mean(post)-Mean(pre)], but...
  8. R

    Within-subject pre-post design with multiple trials pre & post

    Hi, I'm hoping someone is able to help me with my statistical analysis. My study design is a simple within-subject pre-post design, but instead of just 1 trial pre and post, I have 6. The reasons for doing the repeated testing is the variability in test measurement. So far I've looked at...