Spread bets and CFDs are complex instruments and come with a high risk of losing money rapidly due to leverage. 63% of retail investor accounts lose money when trading spread bets and CFDs with this provider. You should consider whether you understand how spread bets and CFDs work and whether you can afford to take the high risk of losing your money.
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Z-score

In finance, a 'Z score' is a statistical measure that quantifies the distance (measured in standard deviations) a data point is from the mean of a data set. It can assist in predicting corporate defaults.

Z-test

A Z test is a statistical test used to determine whether two population means are different when the variances are known and the sample size is large.

Zero-day Option

Zero day options volatility refers to the volatility in the price of an option that expires on the same day. These options are highly sensitive to changes in the price of the underlying asset.Learn more