Testing and Tuning Market Trading Systems by Timothy Masters
Author:Timothy Masters
Language: eng
Format: epub
ISBN: 9781484241738
Publisher: Apress
The first step is to partition the ncases columns of returns in n_blocks subsets of equal or approximately equal size. In the [Bailey et al.] paper, the assumption was that ncases is an integer multiple of n_blocks so that all subsets are the same size. However, I believe that this is not strictly necessary, and it is certainly restrictive. Therefore, I use the array indices to point to the starting case of each subset and use lengths to be the number of cases in each subset. The number of cases in each subset is the number of cases remaining divided by the number of subsets remaining. n_blocks = n_blocks / 2 * 2 ; // Make sure it's even
istart = 0 ;
for (i=0 ; i<n_blocks ; i++) { // For all blocks (subsets of returns)
indices[i] = istart ; // Block starts here
lengths[i] = (ncases - istart) / (n_blocks-i) ; // It contains this many cases
istart += lengths[i] ; // Next block
}
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