I have never done a post for PI day. This year I want to do so.So, we all know the simple estimation of PI based on random numbers. The code used here is chosen for speed in R.pi2d <- function(N=1000) { 4*sum(rowSums(matrix(runif(N*2)^2,ncol=2...

I have never done a post for PI day. This year I want to do so.So, we all know the simple estimation of PI based on random numbers. The code used here is chosen for speed in R.pi2d <- function(N=1000) { 4*sum(rowSums(matrix(runif(N*2)^2,ncol=2...

I was browsing Davies Design and Analysis of Industrial Experiments (second edition, 1967). Published by for ICI in times when industry did that kind of thing. It is quite an applied book. On page 107 there is an example where the variance of a process is estimated.DataData is from nine batches from which three samples were selected (A, B and...

I wanted to try some more machine learning. On Kaggle there is a competition How Much Did It Rain? II. This is quite a bigger data set than Titanic. To quote from Kaggle:Rainfall is highly variable across space and time, making it notoriously tricky t...

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