Displaying 1 result from an estimated 1 matches for "ora9iclient".
2002 Aug 14
3
t-test via matrix operations
I need to calculate a large number of t statistics, and would like to do so via matrix operations. So far I have figured out a way to calculate the mean of each row of the matrix:
d <- matrix(runif(100000,1,10), 1000, 10) # some test data
s <- rep(1,ncol(d)) # a sum vector to use for matrix multiplication
means <- (d%*%s)/ncol(d)
This is at least 1 order of magnitude faster than