# anova repeated measures

1. ### Basic questions about pre-/post-treatment comparison and z-standardization

Assume I have three treatment-groups, each with pre- and post-treatment measurements: set.seed(42) n <- 100 df <- tibble( group_a_pre = rnorm(n, mean=0, sd=1), group_b_pre = rnorm(n, mean=50, sd=10), group_c_pre = rnorm(n, mean=5, sd=2), group_a_post = rnorm(n, mean=0.36, sd=1.2), group_b_post...
2. ### Polynomial (quadratic) contrasts: clarifications & inverted-U

Hello everyone, I am trying to see how the motor time of a response to a stimulus (DV: quantitative, continuous) evolves based on difficulty level of the task (IV: 8 levels, categorical). My hypothesis is that motor time will increase, then decrease (inverted U shape). I conducted a RM ANOVA...
3. ### Advice on statistical analysis of in vivo bacterial data

Hey everyone! Cattle are the main natural reservoir of STEC (Shiga toxin-producing E. coli) and excrete these bacteria in their feces. Human transmission occurs through consumption of fecally contaminated food or water, resulting in serious diarrhea and kidney damage. Currently there is no...
4. ### Choosing the best ANOVA

Hello, I have this data set and I have quite some trouble choosing and running the best ANOVA to deal with it. There's a 2x2 design: testing if people who are blind have better hearing than people with normal vision, and whether this is influenced by the type of sound. The data are thresholds...
5. ### Can we apply statistics on replicated data (Nested repeated measure)?

Dear Experts, In my study I have 2 groups i.e controls (n=23) and patients (n=30). And again in patients, I have 2 sub-groups i.e subgroup1 (n=15) and subgroup2(n=15). I have spinal cord area (SCA) at 4 different spinal cord levels (C1, C2, C3, C4) from these groups. I would like to investigate...
6. ### What post-hoc test to use with 2x2 repeat measures ANOVA

I believe this question should be relatively simple. I have a 2x2 repeat measures anova for a performance task. My two factors are presence and absence of an observer and presence and absence of music playing in the background, therefore my 4 conditions are (1)no observer-no music...
7. ### 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...
8. ### One-way between-groups ANOVA or one-way repeated measures ANOVA

Hi guys, I am currently writing my masters dissertation I have been advised to use a one-way between groups ANOVA test however I am not sure this is correct. Each participant had plantar pressure of their foot recorded on three occasions: 1. with no tape applied, 2. with zinc oxide tape...
9. ### Anova Repeated Measures to compare three different variables?

In a psychology research (not published yet) an Anova Repeated Measures test was used to compare three different variables measured (at the same time) on the same group of subjects. These variables are somewhat related - the diffuse loneliness, the loneliness of alienation and the dissociative...