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ANOVA stands for ANalysis Of VAriance, a statistical model and set of procedures for comparing multiple group means. The independent variables in an ANOVA model are categorical, but an ANOVA table can be used to test continuous variables as well.
6
votes
How many participants do I need to carry out an four-way Anova?
Psychological Bulletin, 112(1), 155-159. doi:10.1037/0033-2909.112.1.155
Furthermore, as mentioned by Anne Z, four-way ANOVA is not the correct term. … You probably mean one-way ANOVA with four factor levels. …
2
votes
What method to use to analyse 3 groups of independent variables?
A three-way ANOVa with factors $A \times B \times C$ sounds pretty reasonable to me. Then you can see whether or not A, B, or C or any interactive combination thereof influences G. …
7
votes
Accepted
Multiple measurements per trial in R
There are two options on what to do:
As you said, use standard repeated measures ANOVA and aggregate over the measurements. afex offers a bunch of convenience functions automatically aggregating the …
1
vote
Two-way mixed effects ANOVA model
Model $\textbf{(1)}$ + $\textbf{(2b)}$ is the standard split-plot ANOVA with a random effects for $B$, the repeated-measures factor $C$ and fixed effect $ \alpha$. …
1
vote
What is the meaning of an F value less than 1 in one-way ANOVA?
10.1027/1614-2241.3.1.35
The abstract says:
Standard statistics texts indicate that the expected value of the $F$
ratio is $1.0$ (more precisely: $N/(N-2)$) in a completely balanced
fixed-effects ANOVA …
5
votes
Is ANOVA being misused for these binary data?
Whereas it is true, that the dependent variable in an ANOVA should not be binary, but interval scaled (i.e., continuous), this is not true for the independent variable. …
1
vote
Help with unbalanced 2-factor ANOVA in R
That seems to be a pretty straightforward thing, an unbalanced design with one DV age and two IVs: gender and kill. You could analyze this easily in R using package afex (for which you will need an id …
2
votes
Mathematical Explanations behind ANOVA
I don't know if mathy enough (but it should have the right references to get you started):
Gelman, A. (2005). Analysis of Variance: Why It Is More Important than Ever. The Annals of Statistics, 33(1) …
1
vote
How does "correlation among repeated measures" work for repeated measures power analysis in ...
I would guess the explanation is something like this: The higher the correlation between the time points, the lower the proportion of unshared variance. That is, the lower the proportion of variance t …
2
votes
Repeated measures techniques for uneven trials per condition?
In a repeated-measures ANOVA you can only have one observation per cell of the design and unit of observation. …
2
votes
Is it appropriate to examine an interaction effect that is almost statistically significant?
To say something similar to the other answers in slightly different words.
I would do the following:
Report that the (hopefully expected) interaction is almost or marginal significant or that there i …
1
vote
How to describe study design looking at effect of a training program on two age groups and ...
If it is only another within-subjets factor (that is how I would read it) you could still use a mixed or split-plot ANOVA (instead of a mixed model). … However, if you want the age-by-training interaction you would have to quantify that with the usual ANOVA effect sizes (e.g., eta-squared) or convert this into r-squared. …
2
votes
Should I include an argument to request type-III sums of squares in ezANOVA?
The R-world doesn't like Type 3 SS to much.
One of the usually cited references is the "Exegeses on Linear Models" by Bill Venables (2000).
I hope I am not misciting him, but I think his main argume …
1
vote
Analyse within-subject data as between-subject data
The overall ANOVA uses the full within subject design.
The between-subjects ANOVA just uses the data from the first session and compares those. …
2
votes
Question with R and repeated measures
Both functions are basically wrappers for car::Anova(). However, both need a variable coding the subject (i.e., a subject identifier). I don't know what it is in your case. … your data is in a data.frame called dat):
nice.anova(ez.glm(id = UNKONW, dv = "x", data = dat, between = "Trt",
within = c("Day", "Rep")))
Note, the call to nice.anova, produces a nice ANOVA …