[R] r-help using random generating

Adaikalavan Ramasamy gisar at nus.edu.sg
Wed Mar 19 06:14:34 CET 2003

Yes it looks like a really good student exercise into the sampling
properties of a distribution.

What you need to do is initialize vectors beforehand that will contain
the mean and variance values. Then simply use a for() loop that
generates 5 random numbers. Use the mean(), var() and store the values
into the vector. Then a simple plot() should suffice. 

Since it is a simple problem, I will leave you to it.

-----Original Message-----
From: Murray Jorgensen [mailto:maj at stats.waikato.ac.nz] 
Sent: Wednesday, March 19, 2003 12:39 PM
Cc: R-help at stat.math.ethz.ch
Subject: Re: [R] r-help using random generating

Student Exercise?!

Cheryl H. wrote:
> To whom it may concern:
> Given that my sample size is n, my mean is 100, and my sd is 10, I 
> need
> to use a random number generator (which I believe is the function 
> rnorm(5,100,10)), but I need to repeat it a large number of times, and

> then plot the sampling distributions of the sample means, sd's, and 
> variances of those generated sets. I'm having a real hard time trying
> figure out how to do this easily. Please help if possible! Thanks,
> Cheryl
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list 
> https://www.stat.math.ethz.ch/mailman/listinfo/r-help

Dr Murray Jorgensen      http://www.stats.waikato.ac.nz/Staff/maj.html
Department of Statistics, University of Waikato, Hamilton, New Zealand
Email: maj at waikato.ac.nz                                Fax 7 838 4155
Phone  +64 7 838 4773 wk    +64 7 849 6486 home    Mobile 021 1395 862

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