Value Counts & Unique

Analyze the distribution of values in your data with value_counts() and related methods.

Basic Value Counts

Count occurrences of each unique value:

Normalized Counts (Percentages)

Get proportions instead of counts:

Sorting Options

Control the order of results:

Binning with Value Counts

Count values in ranges:

Unique Values

Get distinct values:

Value Counts Across Multiple Columns

Count combinations:

Including Missing Values

Count NaN as a category:

Exercise: Count Categories

Exercise: Count Unique

Key Points

• value_counts() counts unique values
• normalize=True for percentages
• sort_index() to sort by values
• unique() returns array of unique values
• nunique() counts unique values
• dropna=False includes NaN in counts
• Can count combinations of multiple columns