anchor.diff:    ///  - `groupSelector` - A delegate that returns a new group key, based on the key in the input series
     ///
     /// [category:Statistics]
  -  static member StdDevLevel(series:Series<'K1, float>, groupSelector:Func<'K1, 'K2>) = 
  +  static member inline StdDevLevel(series:Series<'K1, 'V>, groupSelector:Func<'K1, 'K2>) = 
       Series.applyLevel groupSelector.Invoke Stats.stdDev series
   
     /// Groups the elements of the input series in groups based on the keys
  
positive.code:   /// Returns the sum of the elements of the series of float values.
    /// [category:Statistics]
    [<Extension>]
    static member Sum(series:Series<'K, float>) = Stats.sum series
  
    /// Returns the sum of the elements of the series of numeric values.
    /// [category:Statistics]
  
negative.code:   /// Returns the smallest of all elements of the series.
    /// [category:Statistics]
    [<Extension>]
    static member inline Min(series:Series<'K, 'V>) = Stats.min series |> Option.get
  
    /// Returns the greatest of all elements of the series.
    /// [category:Statistics]
    [<Extension>]
    static member inline Max(series:Series<'K, 'V>) = Stats.max series |> Option.get
  
    /// Returns the mean of the elements of the series.
    /// [category:Statistics]
    [<Extension>]
    static member inline Mean(series:Series<'K, 'V>) = Stats.mean series
  
    /// Returns the standard deviation of the elements of the series.
    /// [category:Statistics]
    [<Extension>]
    static member inline StdDev(series:Series<'K, 'V>) = Stats.stdDev series
  
    /// Returns the skewness of the elements of the series.
    /// [category:Statistics]
    [<Extension>]
    static member inline Skewness(series:Series<'K, 'V>) = Stats.skew series
  
    /// Returns the kurtosis of the elements of the series.
    /// [category:Statistics]
    [<Extension>]
    static member inline Kurtosis(series:Series<'K, 'V>) = Stats.kurt series
  
    [<Extension>]
    [<Obsolete("Use StdDev instead")>]
    static member inline StandardDeviation(series:Series<'K, 'V>) = Stats.stdDev series
  
    /// Returns the median of the elements of the series.
    /// [category:Statistics]
    [<Extension>]
    static member inline Median(series:Series<'K, 'V>) = Stats.median series
  
    /// Groups the elements of the input series in groups based on the keys
    /// produced by `groupSelector` and then returns a new series containing
  