F-ratio and p-value
To do the ANOVA analysis you actually need the F-ratio and the corresponding p-value. These are easy to calculate now that you have everything else.
Remember the formula to calculate the F-ratio is given by
$$ \begin{aligned} F & = \frac{ms_a}{ms_{s\times a}}\end{aligned}$$
This exercise is part of the course
Intro to Statistics with R: Repeated measures ANOVA
Exercise instructions
- Calculate the F-ratio using your previous results.
- Calculate the corresponding p-value using
pf()
. First you have to fill in the value of the F-ratio. Complete the command by filling in the correct number of degrees of freedom for the F-distribution:df1
anddf2
for the second and the third arguments, respectively.
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
## wm, ss_sa, and ss_subjects are available in your workspace
# Calculate the F-ratio
f_rat <-
# Define the degrees of freedom of the F-distribution
df1 <-
df2 <-
# Calculate the p-value
p <- 1 - pf(___, ___, ___)