Hello, all

I am a grad in statistics. Following is the question that took me a lot of time and I still cannot get it:

I want to generate random samples from given finite population with known weights. For example, the given finite population is {1,3,5,7}, now I want to draw a random sample from the population with size 500, we are also given that the probabilities of getting 1, 3, 5, 7 are 0.1, 0.4, 0.2, 0.3, respectively. Each of this kind sample contains 500 data points (replications of 1, 3, 5 and 7).

I read the relevant chapters in NR, but cannot get it. Thank you in advance for your kind assistances.

utpc

Use the ran1 or ran2 function to produce random numbers on the interval [0 to 1). Then use the following selection method:

Output of ran1/ran2 selected random number
[0 - 0.1) 1
[0.1 - 0.5) 3
[0.5 - 0.7) 5
[0.7 - 1.0) 7

Note that the notation [a - b) means a number >= a, and < b.