anova

  1. R

    Calculation of Sample Size for one-way ANOVA

    Hello, I have problem of calculating sample size for one-way ANOVA. My settings is the following: Population size = 100 Controlled group = 1 group Treatment group = 2 groups Power = 0.8 Alpha = 0.05 Group allocation ratio: All groups have the same sample size standard deviation of...
  2. T

    Please help! Should i use a Mixed ANOVA?

    I am struggling on which type of ANOVA to use for my work, I will provide as many details below about the study design, at the moment I am thinking mixed ANOVA but im encountering some problems which suggest that I have chosen the wrong type. I have two groups, one with a particular defect...
  3. S

    ANOVA 2-way all subgroup combinations

    Hello - I am wanting to do 2-way ANOVA tests in SAS. I am having trouble getting results against all the subgroups I want to. It is best explained by the dummy data file I created (attached). I want to see ANOVA results of all 'Size' and 'Industry' group combinations. So for example the...
  4. B

    Data with > values

    Okay, so with the data set I currently have I would usually run a one way ANOVA with probably a Dunnets post hoc test to compare and find the statistical differences. I am encountering a problem in that with the experiment used there are a number of values which exceeded the maximal stimuli. For...
  5. S

    Main effect vs. Interaction effect in ANOVA

    I think that a researcher is in general more likely to find a significant main effect than a significant interaction effect in ANOVA. Do you agree with me? Why?
  6. E

    MSE in GLM ANOVA

    Sorry for the wall of text, but I'm trying to figure out how to proceed and feel as though I need to clue you in as best I can. Experimental Design: Whole plot: Tree species (Spp) Subplot: Location relative to canopy boundary (In/Out) Tests: 2-way ANOVA on data collected for several...
  7. Z

    Can I use ANOVA on Rstudio using a Likert Scale like questionnaire ?

    Hello, this is my first post on talkstats so hopefully I make sense. I am 'Comparing Interactive verse non-interaction education displays of Insect and Reptile and Amphibian Conservation'. I handed out a questionnaire to three different groups; a control, a group that was part of the...
  8. A

    Samples p-value in ANOVA

    Hi, my problem regards ANOVA: if the ANOVA test is sginificant (p-value<0.05), is there a way to calculate a p-value for each sample, in order to detect which is (are) significant different from the others? I know there are some post hoc tests, like Tukey or Scheffé, but they all compare...
  9. H

    Non-parametric tests for repeated measures data

    Hi, I'm having difficulty finding an appropriate test for my data. The experiment is looking at the distance animals have moved from a translocation site over a 12 week period (measured weekly), where animals are divided into 3 treatments (ie. I am looking at whether the different...
  10. K

    ANOVA - which one to use?

    Hello, we are doing an experiment where body consistence (weight, proportion of muscles, fat, water in body etc.) is measured. We have 103 respondents, water and banana (factor meal) were given to EACH of them a then they were measured in 5 different times (time 0, immediately after consuming...
  11. Y

    How can I do one-way ANOVA for each GENDER?

    http://imgur.com/a7Sr11g The data has 5 treatments and has gender considerations. I would like to do a one-way ANOVA within each gender and have it displayed like the attached photo. How can I do this? Thanks! James
  12. M

    Default contrasts in ANOVA orthogonal?

    Hi, I have a question regarding the default contrasts anova() uses R. As far as I understand, the default setting in anova is, that each group/treatment condition is compared to the baseline group. If I assume we have three treatment conditions A, B and C, and A is my baseline, I can now...
  13. C

    z-score within participants before or after averaging conditions

    Hi, I have a Group(2) x Condition(5) ANOVA design. Group is a between factor and Condition is within. I'm specifically interested in interaction effects (not overall group differences). I want to z-standardize the data within each participant to account for inter-individual differences...
  14. R

    Implications of non fully randomised design for ANOVA: How do I deal with problem

    Hello, I'm a student attempting my first horticulture type experiment with a class mate and although we thought we had done enough reading to set-up the experimental design I now think we misunderstood how to randomise properly (my teacher also missed this when we proposed the study). Id very...
  15. B

    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...
  16. E

    How to measure- effect of additional categorical DV on repeated m. ANOVA?

    Hello, I am helping a colleague analyze data from a user study. I am a little unclear how to deal with one of her measures. I would greatly appreciate any help! Description: Independent variable: -interface modality: -audio (A), visual (V), haptic (H), control (C- no interface) Main...
  17. K

    2x2 repeated measures Anova or one way

    I need help with the analysis of my latest experiment, I need to write it up by Mon so please help! I have two conditions with two different time intervals A1, A2 and B1 B2, I want to see whether the condition in which participants are in is influencing their response time. I was thinking...
  18. K

    HELP PLEASE :) ANOVAs repeated measures

    More I read more I get confused, so please help me ! 1. In 2 (2 conditions)x2 (2 time intervals) within subjects Anova if normality assumption is violated- what is the best option to go about? Ignore? 2. In 2x2 within subjects Anova if I have an interaction effect (all data ok)? Do I...
  19. B

    Repeated Measure ANOVA with muliple samples per participant

    I am currently doing an experiment where I measure the time it takes for a participant to complete a task. There are 7 different modes for the task and I test each participant in every mode. I randomize the order that each participant does the modes. This is the format of the data I'm...
  20. L

    [Prism 5] Gather or Individual Analysis? ANOVA or Kruskal?

    To whom it may help: My research is on cellular/molecular responses after hormones farmacological administration and I'm not quite sure how to perform statistical analysis. I have 15 test groups plus my control group (DMEM) and I did my experiments two different times (2 occasions) in...