Skip to content
START WITH A QUESTION

What would you like to understand?

Find an answer. See the moment it becomes clear. Follow the idea further.

← Concept directory

Answers for “Z-score 公式是什么?”

3 keyword matches

Understanding your question. You can explore the search results below now.

Meet the concept

↗

The Z-score formula normalizes the data by subtracting the mean (μ\mu) from the original value (XX) and dividing the result by the standard deviation (σ\sigma). The formula is X′=X−μσX' = \frac{X - \mu}{\sigma}.

Conditions: Requires knowing the mean and standard deviation of the dataset

Meet the concept

↗

Standardization transforms a feature value xx into z=x−μσz = \frac{x - \mu}{\sigma}, targeting a mean of 0 and a standard deviation of 1 for the transformed feature.

Conditions: Applied per numerical feature.; Uses the feature mean μ\mu and standard deviation σ\sigma.; Assumes σ>0\sigma > 0.

Meet the concept

↗

Standardization (or Z-score normalization) is a linear transformation that centers the data around zero and scales it to have a standard deviation of one. It subtracts the mean of the feature from each data point and divides by the standard deviation.

Conditions: Applied to a continuous numerical feature.; Requires knowing the mean and standard deviation of the feature.; The standard deviation must not be zero (to avoid division by zero).