Interview Q&A / Data Science
Data Science interview questions
Statistics, pandas, cleaning data and exploratory analysis for analyst and data science roles.
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- What is the difference between normalisation and standardisation?
Normalisation (min-max scaling) squeezes values into a fixed range, usually 0 to 1, using (x - min) / (max - min). Standardisation (z-score scaling) shifts values to mean 0 and standard deviation 1, using (x - mean) / std. Standardisation handles outliers better, and both should be fitted on training data only.
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