Chapter 9 Random Sampling in R
We use random sampling for a lot of things in statistics. Anytime we use random sampling we need to set a random seed.
This ensures that if you run the code again, you will get the same results.
9.1 The Sample Function
Most of the time when we create a random sample, we use the sample function. It has three inputs:
sample( What I am sampling from? , How many samples do I want?, Do I want to sample with Replacement?)
For example, suppose I want to choose 3 random numbers between 1 and 10, but I do not want any duplicates. My inputs are then:
- What I am sampling from?
1:10
- How many samples do I want?
3
- Do I want to sample with replacement? No, so
replace = FALSE
This means that the code I need is