# means(_:_:order:) Generates a data frame that contains the average mean of each group’s rows along a column you select by name. ``` func means(_ columnName: String, _ type: N.Type, order: Order? = nil) -> DataFrame where N : FloatingPoint ``` ## Parameters `columnName` The name of a column. `type` The type of the column. `order` A sorting order the method uses to sort the data frame by its mean column. --- 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)