anova

  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. 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...
  12. 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...
  13. 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...
  14. A

    What is the best statistical test/approach for pre- and post-intervention analysis?

    Dear colleagues, We assessed several psychological measures (e.g. self-compassion scale, five-facets mindfulness questionnaire, satisfaction with life scale) before and after a Mindfulness-Based Psychoeducational Program for groups of people with acquired brain injuries. We would like to...
  15. A

    formula for factorial ANOVA interaction effect

    Good day. I have a question regarding the formula for calculating interaction effects. In Andy Field book he gives: SSa×b = SSmodel − SSa − SSb, where a and b are the different factors in our model. What happens when we have 3 or more factors? Is this then: SSa×b×c = SSmodel - SSa - SSb - SSc...
  16. L

    How can I compare the effect of different VI on my VD?

    Hi, I would like to compare the effect of different independent variables on a dependent variable. My VD is quantitative. I have 3 VI that are nominal: Valence (2 levels), Rhetorical orientation (2 levels), statement type (3 levels). It looks like that: In order to asses the influence of...
  17. D

    Need help: What is the appropriate test to perform?

    Dear All, I have some troubles choosing the right test to my data. I have 7 groups in total with N=8 samples each. Group 1: control Group 2: Variable 1 = A, Variable 2 = 1 Group 3: Variable 1 = A, Variable 2 = 2 Group 4: Variable 1 = A, Variable 2 = 3 Group 5: Variable 1 = B, Variable 2 =1...
  18. J

    Significant interaction no significant comparision

    Dear community, I did a linear mixed model full factorial with 2x2. I use the linear mixed model like an ANOVA and I have one significant main effect and a significant interaction effect.To solve the interaction I split my data by one variable and analyze the main effect by the other variable...
  19. T

    FINDING THE SS IN ANOVA TABLE

    Hi All! I've been trying to manually calculate the sum of squares for 2 independent variables in an ANOVA table and can only seem to work out two total sum of squares exaplianed by the two independent vairables. Is there any way that I can work out how many sum of squares is attributed to each...
  20. V

    When 'not' to use MANOVA?

    Hey! This is about my PhD thesis where I am trying to see the pattern of memory deficit among different types of hypothyroidism. I have used a between subject group design with 1 IV with four levels. Thus, I have 4 four groups which are: Subclinical Hypothyroid group N= 14 Overt Hypothyroid...