two-way anova

  1. B

    [ANOVA in R] Which ANOVA to run?

    Dear forum members, I have been looking for a solution that fits my analysis both on this forum and the web and have returned empty handed so decided to post my own thread. For my Master's thesis, we have performed an experiment with 160 plants from 10 different genotypes, divided in 2...
  2. H

    Failure to calculate significance in the correct test! Two-way mixed ANOVA. Pls help!

    Hi all, I need some help with my SPSS testing. I am testing how salinity causes a difference in population growth for a species of jellyfish polyp. I have 3 groups of jellyfish polyps, which remain independent from each other. Each group of polyps is put under a different treatment of...
  3. D

    Justification for t-tests instead of 2-way ANOVA (no interaction)

    HI there, I need help with justification for why I should use a t-test instead of a two-way ANOVA. My two-way ANOVA gave me a main effect of Diet (ethanol and control) and a main effect of Drug (drug and no drug), but no Diet x Drug interaction. Since there is no interaction, I don't feel...
  4. A

    ANOVA - discrepancy between main result and model parameters

    I am running a two-way ANOVA examining the influence of both school and gender on Likert scale answers. The Type III SS results show school significant (p=0,001), but gender or gender*school not significant. Type III Sum of Squares analysis (Variable 10.Based on your overall perception of...
  5. A

    Interaction term in two-way anova

    Dear all, I would like to see the effect of two independent variable (a,b) on a dependant variable (c). a and b are covariate. Could you please let me know how to do two-way anova if 1) there is an interaction between a and b 2) there is no interaction between a and b I am quite...
  6. R

    Dissertation test results. Help!!!

    Hi Guys, I was just wondering if you could help me out with some statistics stuff as I'm having a little trouble with interpreting my dissertation test results in a mathematical way. Basically, I have done some testing on reported presence scores when changing different audio...
  7. N

    Can subject be a factor?

    Let's say we have an epidemiology research with 5 subjects (for simplicity): John, Mike, Andy, Frank and Philip. They contacted meningitis and their fever was measured at day and night. One might be interested in checking whether some subjects have fever only at day to guide treatment or further...
  8. F

    Question about two-way anova with interaction effect

    Hi! I just read this from a textbook on the topic of two-way anova: "If interaction effect between factor A and factor B is significant, we cannot test the main effect for A or B ". I'm just not sure why it is unlikely to test the significance of main effect for A or B in an two-way anova with...
  9. S

    Can I do a two-way ANOVA on this data?

    Hi, I have find whether there is significant difference in score between two groups over time. The data is pooled cross sectional. The table is looks like this (average score in each year is shown). Can I do a two-way ANOVA on this table to see whether there is significant difference between...
  10. W

    Regression analysis or ANOVA for unequal sample sizes

    Hello everyone :) First I want to apologize for my Eniglish, I´m not a native speaker. I am currently working on a research for school purposes, as I can´t write what my research is about I describe example equal to my research: I study relationship between eating bananas and extraversion...
  11. S

    Does my research proposal make sense? [Basic Stats]

    Hi everyone, I'm new to statistics, statistical packages and research methods in general. Yet I'm fascinated by the subject and want to learn as much as possible. I would love to have inputs by you experts on my project proposal and the analysis I have in mind. The research purpose of my...
  12. A

    Using a repeated measures, two-way ANOVA.

    I want to compare the outcome of two different algorithms applied to one set of MRI images. Each MRI image will be manipulated twice. Once using the first algorithm and once using the second algorithm. The data will consists of two groups of values. I want to see if the averages of the two...
  13. X

    •Comparing groups - which test should I use(t-test or ANOVA)

    The general infomation is: We have 6 kinds of material and have 4 group for each material now(please see the attached table) we cut one tooth to two halves(A and B) and bonded two composite cylinder to each half(cylinder 1 and 2). half A is control group(just following the normal bonding...
  14. M

    Non-parametric test equivalent to two-way anova?

    Hi everyone. I have a question on non-parametric tests that replace anova tests. In my first data set, I have scat density data grouped according to habitat type. I have used Kruskal-wallis instead of one-way anova since it is a non-parametric test which does not assume normal distribution...
  15. Z

    Confused with two-way ANOVA hypotheses

    Hello all, I am working on my assignment of two-way ANOVA and feel totally lost. In my understanding, hypotheses for two-way ANOVA are three. One refers to Factor A (e.g., conditions of gender), and one for Factor B (e.g., treatment and control groups) and one for the interaction of A...