Simulation - Hadley Wickham

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•

What do we

want to see?

A plot of the different estimates, vs. number

of sample points?

So we need a data.frame with columns n,

and sample mean (and sample sd. as well)

How can we do this?

Can’t just use replicate

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• • • • What do we want to see? A plot of the different estimates, vs. number of sample points? So we need a data.frame with columns n, and sample mean (and sample sd. as well) How can we do this? Can’t just use replicate

New function • sapply • Takes first argument, and calls second argument one at a time • • • • sapply(1:10, sum) vs sum(1:10) sapply(1:10, function(n) mean(rnorm(n)) mean

Page 1 and 2: Simulation Hadley Wickham
Page 3 and 4: • • • • Basics of simulatio
Page 5 and 6: Generating random numbers • runif
Page 7 and 8: Repetition • Use the replicate fu
Page 9 and 10: What your code might have looked li
Page 11 and 12: Dry rule
Page 13 and 14: • Functions Let us avoid repetiti
Page 15 and 16: • • • Your turn Create a func
Page 17 and 18: Your turn • Figure out how to do
Page 19: • • Another exploration How doe
Page 23: • • • • Your turn Look at t

Simulation - Hadley Wickham

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