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Line 1: #REDIRECT [[Standard score]] ~~{{context}}~~ A '''standardized variable''' is the value of a variable ''minus'' its [[mean]], ''divided by'' its [[standard deviation]]. It is sometimes called a '''z-value'''. The z-value has men zero and variance one. Thus it is useful in [[statistical analysis]]. If ''z'' has a [[Normal distribution]], then it has a standard normal distribution, N(0,1). [http://books.google.co.uk/books?id=0aLyvQiMDuYC&pg=PA100&lpg=PA100&dq=%22standardised+variable%22&source=web&ots=5-JXogECpZ&sig=Z6tyMtrs7I3jEY08KfjqDTrcWsc&hl=en]