What is data normalization and standardization?

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Data normalization and standardization are techniques used to scale numerical data so that features are on a similar scale, which improves the performance of machine learning models.

✅ Normalization

Normalization scales data to a range between 0 and 1 (or -1 to 1).

Formula:

x_normalized = (x - min) / (max - min)

Use Case:

Useful when features have different ranges and you want to bring them to a common scale without distorting differences.

Example:

from sklearn.preprocessing import MinMaxScaler

scaler = MinMaxScaler()

normalized_data = scaler.fit_transform(data)

✅ Standardization

Standardization scales data to have a mean of 0 and standard deviation of 1.

Formula:

x_standardized = (x - mean) / std

Use Case:

Best when data follows a normal distribution. Often used in linear models, SVMs, PCA, etc.

Example:

from sklearn.preprocessing import StandardScaler

scaler = StandardScaler()

standardized_data = scaler.fit_transform(data)

🔍 Summary:

Normalization: Rescales to [0,1]; use for bounded features.

Standardization: Centers data; use for normally distributed data.

Both help models converge faster and perform better by ensuring features contribute equally.

Read More:

How do you detect outliers?

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