anova

  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. 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...
  12. 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...
  13. 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...
  14. 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...
  15. 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...
  16. N

    GPower f (V) effect size interpretation

    I am having difficulty understanding how to interpret effect size f(V) on GPower for a priori sample size calculation for ANOVA repeated-measures, within-between interaction. I am conducting an a priori power analysis to calculate sample size for ANOVA repeated measures, within-between...
  17. S

    Best statistical method for CFU/ml?

    I have sets of data in CFU/ml for different sampling sites collected in two different seasons. 1. How do I compare the CFU/ml between sampling sites within one season? 2. How do I compare the CFU/ml in different seasons of the same sampling site? one-way ANOVA?
  18. E

    Test wanted for comparing algorithms

    Study design Suppose I want to compare algorithm runtime performance (measured in seconds) of different algorithms for the same problem type. There are several problem instances for this problem type on which the algorithms are tested and performance is measured. Possible tests As far as I...
  19. G

    Anova question

    Anova question... I know anova is typically used on three groups who take one test, for example, but can you use it on one group who takes three tests (to compare the means on the three different tests, when all participants took all three tests)?
  20. R

    GLM for two quantitatives data as DV

    Hello all, I have the following data res=structure(list(Zone = 1:12, Cat1 = c(0.5, 3.5, 1, 1, 2, 5.75, 9.33333333333333, 9, 11.6666666666667, 3.41666666666667, 4.58333333333333, 0), Other_cat = c(48.5, 45.5, 42, 52, 50, 42.25, 39.6666666666667, 34, 41.3333333333333, 42.5833333333333...