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dnorm() Function in R

dnorm() function in R allows you to calculate the probability density function for a normal distribution for a given mean and standard deviation. This guide shows you how to use the dnorm() function in R.

dnorm() syntax

dnorm(x, mean = 0, sd = 1)

Arguments

  • x = numeric value to test for probability
  • mean = mean of the distribution
  • sd = standard deviation of the distribution

The mean and sd arguments are optional. If you do not pass a value to them, they will take the default values as mean = 0 and sd = 1.

Example 1: dnorm() function with a single value

Suppose we want to calculate the probability density function of 5 with a mean of 10 and a standard deviation of 3.

x <- dnorm(5, mean=10, sd=3)

Output

[1] 0.03315905

Example 2: dnorm() Function with a vector of values

Say we want to calculate the probability density function of each element inside a vector with a mean of 10 and a standard deviation of 3.

#creating a vector
my_data <-c(1,2,3,4,5)
#calculating probability density function of the vector
x <- dnorm(my_data, mean=10, sd=3)
x

Output

[1] 0.001477283 0.003798662 0.008740630 0.017996989 0.033159046

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