  In general, randomness tests included in a test suite are not independent of
each other. This renders it difficult to fix a rational criterion through the
whole test suite with an explicit significance level. In this paper, we focus
on the Non-overlapping Template Matching Test, which is a randomness test
included in the NIST statistical test suite. The test uses a parameter called
"template" and we can consider a test item for each template. We investigate
dependency between two test items by deriving the joint probability density
function of the two p-values and propose a transformation to make multi test
items independent of each other.
