stylistic:tone, quality:correction
Measures and tests

There are many practical measures of randomness for a binary sequence. These include measures based on frequency, discrete transforms, complexity, or a mixture of these, such as the tests by Kak, Phillips, Yuen, Hopkins, Beth and Dai, Mund, and Marsaglia and Zaman.

Quantum nonlocality has been used to certify the presence of genuine or strong form of randomness in a given string of numbers.