# RowGroupingProtocol Implementations ## Topics ### Instance Methods [`func randomSplit(by: Double, seed: Int?) -> (RowGrouping, RowGrouping)`](/documentation/TabularData/RowGrouping/randomSplit(by:seed:)) Generates two row groupings by randomly splitting the original with a proportion and a seed number. [`func summary() -> any GroupSummaries`](/documentation/TabularData/RowGrouping/summary()) Generates a group summaries instance for the columns of the row grouping. [`func summary(of: [String]) -> any GroupSummaries`](/documentation/TabularData/RowGrouping/summary(of:)) Generates a group summaries instance for the columns you select by name. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)