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[RDF][Docs] Explain that RDF uses Kahan sums for the mean. #19891

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Sep 16, 2025
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[RDF][Docs] Explain that RDF uses Kahan sums for the mean. #19891

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2 changes: 2 additions & 0 deletions tree/dataframe/inc/ROOT/RDF/RInterface.hxx
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Expand Up @@ -2788,6 +2788,8 @@ public:
///
/// If T is not specified, RDataFrame will infer it from the data and just-in-time compile the correct
/// template specialization of this method.
/// Note that internally, the summations are executed with Kahan sums in double precision, irrespective
/// of the type of column that is read.
///
/// This action is *lazy*: upon invocation of this method the calculation is
/// booked but not executed. Also see RResultPtr.
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