Final answer:
The f-distribution density function in R can be defined using the df function in the stats package.
Step-by-step explanation:
The f-distribution density function in R can be defined using the df function in the stats package. The function takes two arguments: x and df1. The argument x represents the values at which the density function should be evaluated, and df1 represents the numerator degrees of freedom. For example, if we want to evaluate the f-distribution density function at the value 2 with 3 numerator degrees of freedom, we can use the following code:
df(x = 2, df1 = 3)
This will return the density of the f-distribution at the specified value.