CODEWITHSUNDEEP
rrandomnormal-distribution
Song Calderone Zhang
Song Calderone Zhang

Reputation: 421

Expression for random normal error

Here they use ei to denote the random normal error, can any one explain why they use:

rnorm(length(xi),0,1)

to express this:

ei = rnorm(length(xi),0,1)
yi = sin(2*pi*xi)+ei

Upvotes: 1

Views: 52

Answers (1)

Florian
Florian

Reputation: 25395

See the documentation for rnorm, we can use that to explain your statement:

ei = rnorm(length(xi),0,1)
  • length(xi) because you want an error term for each observation.
  • 0,1 because you want the errors to be random normal (mean 0, standard deviation 1)

Hope this helps.

Upvotes: 3

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