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      delta7avg
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      Contents

      delta7avg

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      Article summary

      Returns the difference in 7 row average between current row and previous row

       

      1. Calculates the average for the previous seven rows
      2. Calculates average for current row and previous 6 rows
      3. Calculates difference between the 2 averages

      The first 7 rows are returned as NULL

      Purpose

      Use this function to: 

      • Calculate daily change in 7 day average

      Calculation

      delta7avg = 7avg(x) - 7avg(x-1)

       

      7avg(x) = Sum([X-1]:[X-7]) / 7

      7avg(x-1) = Sum([X]:[X-6]) / 7

      Sum([X-1]:[X-7])= Sum of previous 7 rows

      Sum([X]:[X-6])= sum of current row and previous 6 rows

      Sample Result

      Parameters

      ParameterDescription
      DimensionsDiscrete field(s).    All fields must come from the same table.
      NameName to be displayed as Column Header in result grid
      MeasureThe field to be used in the post-function calculation.
      • Must be numeric if Function is anything other than COUNT.
      • Must come from same table as DIMENSIONS.
      • Supports Discrete or Continuous DataTypes.
      FunctionCOUNT / SUM / AVG / MIN / MAX / STDEV
      Postdelta7avg
      ValueOptional.   Filter to apply when evaluating FUNCTION.   Only records in the Filter Recordset will be included in the Function and Post-Function calculations.
      Must come from same table as DIMENSION/MEASURE or be linked to the Dimension table.
      Axis0 / 1.    Y-Axis to use when plotting graph.     Default = 0
      PlotY / N.   Specifies whether measure’s output column should be plotted on graph.  Default = Y
      ResolveOptional.   Resolve level for the measure.   If blank, Resolve = Dimension Table
      Series TypeDefault / Bar / Stacked Bar / Line / Spline / RangeLow / RangeHigh / CSLow / CSHigh / CSOpen / CSClose
      Determines the graph style for the measure.
      PopupDefault / None / Extended
      Prefix$ / £ / E / %

      Usage Notes

      See 7avg and 7avg(percent) for more information on Rolling averages

      Example

      • Example use: Daily change in 7 day average

      NOTE: Measure 1 is included purely for illustration. It is not necessary to include this measure for the calculation to work.


      Dimension: [transactions].[ywoy]

      Measure 1

      • Name: = Sum
      • Measure: = transactions.castprice
      • Function: = Sum
      • Post: =
      • Value: =
      • Axis: =0
      • Plot:=Y
      • Resolve:=
      • Series Type:=Bar
      • Popup:=Default
      • Prefix:=

      Measure 2

      • Name: = Rolling 7 day average
      • Measure: = transactions.castprice
      • Function: = Sum
      • Post: = 7avg
      • Value: =
      • Axis: =0
      • Plot:=Y
      • Resolve:=
      • Series Type:=Line
      • Popup:=Default
      • Prefix:=

      Measure 3

      • Name: = delta 7 avg
      • Measure: = transactions.castprice
      • Function: = Sum
      • Post: = delta7avg
      • Value: =
      • Axis: =0
      • Plot:=Y
      • Resolve:=
      • Series Type:=Line
      • Popup:=Default
      • Prefix:=

      Options:  Row Count = 30

      Sort Order: [Ascending Label]












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