Computer Science terms: Z

2 of the Computer Science glossary’s terms, each with the part of the syllabus where you first meet it.

Z

Z-scoreHL only · also z score, standard score: The number of standard deviations a value lies above or below the mean of its feature, calculated as $z = \dfrac{x - \mu}{\sigma}$ .
Introduced in A4.2 Data preprocessing
Zero-day exploitHL only · also zero-day, 0-day, zero-day vulnerability, zero-day attack: An attack that uses a vulnerability unknown to the software's developer, so no patch exists and the developer has had "zero days" to fix it.
Introduced in

Z-scoreHL only · also z score, standard score

The number of standard deviations a value lies above or below the mean of its feature, calculated as $z = \dfrac{x - \mu}{\sigma}$ .

Zero-day exploitHL only · also zero-day, 0-day, zero-day vulnerability, zero-day attack

An attack that uses a vulnerability unknown to the software's developer, so no patch exists and the developer has had "zero days" to fix it.

Introduced in