anova

  1. S

    Multiple ANCOVAs: Post hoc Bonferroni, FDR, or can I use MANCOVA?

    Hi, I am comparing a protein level in multiple (40 to 4000 depending on the analysis) brain areas across three diagnostic groups, with a couple of covariates. I am using ANCOVA to compare the three groups. What is the best way to account for multiple comparisons? Where I am conducting large...
  2. N

    Compare effect of different factors on one trait

    Hello everyone, I'm new here and I need some guidance. I'm trying to help my friend to write a paper for an exam. I have a little experience with ANOVA and using MSTAT, but not so much that I could figure out on my own what to do next. It's really a simple problem and I'm a little bit...
  3. R

    Survival analysis at few dates: glms? logrank? cox ?

    Hello, In many documentation I have read that Kaplan-Meier curves followed by logrank test and/or cox models are the most recommended statistical methods to analyse Survival and test for different factors that may impact the Survival. However, I have also heard that these are suitable if I...
  4. A

    ANCOVA Table - Interpretation

    Hello, I don't know if there is any post already regarding this and, if there is, I am sorry for reposting. I was asked to explain a table from an ANCOVA , specifically the values of F, etc. The table in question is Table 1. Can anyone help? A.
  5. P

    Error term for anova in fully crossed design

    Hi, I'm struggling with the Error() term for an ANOVA. I have data from an experiment where every subject performed a task under the two levels of A AND the two levels of B (ie. I have data from each subject for each of the 4 combinations: A1B1, A1B2, A2B1, A2B2). If I understand correctly, this...
  6. O

    Choice of test

    Hi all, I'm currently inputting the results for my dissertation on 'the effects of caffeine ingestion on repeated sprint performance post-fatigue'. My dependent variable is sprint time (7 x 30 m sprints) and my independent variable is the condition (control, caffeine and placebo). I have already...
  7. T

    Choosing a statistical test when study includes both continuous and categorical variables

    Can logistic and linear regression be used when there are both continuous and categorical predictors? Is there any benefit to starting with ANOVA/t-test/chi-square?
  8. A

    What stats tests should I be running?

    I have data looking at the number of different prey species and the number of different predator species that visited a waterhole and I'm categorizing by time, so eg. 3-6am : 5 prey, 2 predator 6-9am: 10 prey, 1 predator ect. I've tried doing a 2 way anova, and chi squared test but I dont...
  9. A

    One IV, two DVs, across male/female. What could I use?

    I know I've been posting a lot here lately, this is my last one: I have one independent variable (categorical) and want to determine its effect on two separate dependent variables. I know I could use MANOVA for this. But what do I use if I want to determine the effect of an independent variable...
  10. A

    What Stats should I do?

    I have data looking at the number of different prey species and the number of different predator species that visited a waterhole and I'm categorizing by time, so eg. 3-6am : 5 prey, 2 predator 6-9am: 10 prey, 1 predator ect. I've tried doing a 2 way anova, and chi squared test but I dont...
  11. S

    ANOVA: is this an interaction term?

    I'm doing a research project on red light camera effectiveness. I'm modeling my ANOVA after another study done that is freely available here. I have only one question at the moment. In their ANOVA tables on page 32, is "camera sites after versus other" an interaction term? I'm having some...
  12. V

    Two-way ANOVA interpretation help

    Hi there! I need to write an essay for uni and I was asked to do a two-way ANOVA on a set of continuous data using graphpad prism 8. However, although I understand the principle behind a two-way ANOVA, I'm struggling to interpret the results that graphpad prism has given me. My guess is that...
  13. B

    Which stats test should I use?

    I have an experiment to look at habitat preferences of beetles and the effect of competition. In the first test, a beetle is on his own in an arena and I measured the % of time he spends in each of THREE types of habitat (open, bush and underground). I repeat this experiment with several...
  14. GuPug

    Please Help: Can I remove a level of a factor?

    I need to compare the performance of two groups of subjects undergoing two different treatments over time. I have used a two-way repeated measures mixed ANOVA (SPSS) with - Group (treatment A vs B) as between factor - Time (pre treatment, 1 month after treatment, 2 month after treatment) as...
  15. T

    Interpreting Repeated Measures Anova Results in R

    I just finished conducting a repeated measures anova looking at mean sand grain sizes over time over a 13 year period for seven sites. Each year a sand sample was collected from a different section of the beach for each site: Ex: Sand samples are collected from the foreshore, midshore...
  16. P

    Statistical Test for multiple choice questions

    I Iaunched a survey recently where I have the following types of questions - 1) A multiple choice question (where users can mark more than one correct answer), let's call it variable a. 2) A single choice answer type question (radio button type), let's call it categorical variable b. 3) A...
  17. S

    Counterbalanced caffine within subject repeated experiment

    Dear all, I was wondering if anyone could give me some pointers about how to analyze my thesis experiment. We had 12 participants, each performed something called "Random dot motion" cognitive tests with coffee and decaffinated coffee (randomly counterbalanced) on two separate days. This test...
  18. Y

    Is one-way ANOVA the proper test to use?

    Hello, In my science class, we had to record the amount of time it took for an ant to escape 4 different colored mazes to see if color had an impact on escape time. In determining the statistical significance of the differences in escape time for the different colors, would a one-way ANOVA be...
  19. B

    Coding and Visualizing Repeated Measures and Mixed-Effects Models

    I am doing a study analyzing trends in changing bird diversity over the past 40 years. Surveys have been taken at 20 locations each year. The survey locations are the random effect and repeated each year. This is the code and output I used in the lme4 library...
  20. B

    Protocol comparison: repeated measures ANOVA and mixed linear models

    Hello! This is my first experience with repeated measures ANOVA and mixed linear models. Since I did not found an example that uses a design similar to my experiment, I hope I can get some help. I collected 3 soil samples (SAMPLE_ID) in 4 areas (SITE), totaling 12 samples. My objective is to...