anchor.diff:    [ stock1 (TimeSpan(0, 1, 0)) 1000 |> Chart.FastLine
       stock2 (TimeSpan(0, 1, 0)) 1000 |> Chart.FastLine ]
   (**
  -The above snippet generates 1k of prices in one minutte intervals and plots them using the
  +The above snippet generates 1k of prices in one minute intervals and plots them using the
   [F# Charting library](https://github.com/fsharp/FSharp.Charting). When you run the code
   and tweak the chart look, you should see something like this:
   
  
positive.code: // The $ operator is a shorthand for
  sample.Diff(1) |> Series.mapValues adjust
  
  (***
  In general, the best way to apply custom functions to all values in a series is to 
  align the series (using either `Series.join` or `Series.align`) into a single series
  containing tuples and then apply `Series.mapValues`. The library also provides the `$` operator
  
negative.code: // Sum each column and divide results by a constant
  Frame.sum df / 6.0
  // Divide sum by mean of each frame column
  Frame.sum df / Frame.mean df
  