Blocked Standard Error of the Mean

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Let X be a time dependent vector of length M.

Brake X into N number of blocks.

Let m = FLOOR(M/N) be the block sizes.

Let r = M mod N be the remainder.

for {B1,B2, ... BM} be the blocks.

Sudo code

for N = 2:M
  start = 1
  a is an array of lenth M
  for i = 1:N
    if i > r 
       stop = start+m
       stop = start+m+1
    B = X(start:stop)
    a[i] = mean(B)   
  bsem = sem(a)