DataFrame.describe

DataFrame describe()

Deduplicates the frame's rows (ADR-2026-10-23-08): the first occurrence of each distinct key tuple is kept, in first-appearance order, under the grouping's total multi-column equality (nulls equal, NaN equal, -0.0 equal 0.0). The input frame is never mutated.

Parameters

subset the key column names (all columns when empty)

Returns

the deduplicated frame.

Throws

DataFrameException when a subset name is absent (the

grouping's error). The inspection summary (ADR-2026-10-23-08): a typed DataFrame

a leading statistic STRING column ("count", "null_count", "mean", "min", "max") followed by one column per input column in input order. Numeric columns carry FLOAT64 statistics (mean/min/max null when undefined - empty or all-null); non-numeric columns carry count/null_count and null statistics. No quantiles, median or standard deviation (Tier 2); nothing is stringified.

Returns: the summary frame.