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      delta7avg(percent)
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      Contents

      delta7avg(percent)

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      Article summary

      Returns the difference in 7 row average between current row and previous row as a percentage of the sum of all 7 row averages

      Purpose

      Use this function to: 

      • Calculate changes in rolling 7 day averages as a percentage of overall change

      Calculation

      1. Calculates the average for the previous seven rows [7avg(x-1)]
      2. Calculates average for current row and previous 6 rows [7avg(x)]
      3. Calculates difference between the 2 averages [delta7avg]
      4. Calculates sum of all 7 row averages in result set [sum7avg]
      5. Divides delta7avg by Sum7avg [delta7avg%]

      delta7avg% = delta7avg(x) - sumDelta7avg

      sumDelta7avg = sum( delta7avg[N]:delta1avg[0] )

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

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

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

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

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

      The 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%
      Value

      Optional.   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 Type

      Default / 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

      Delta7avg% depends on the order in which the rows are brought back from the engine (sort order Ascending / Descending, Label / Value)

      Delta7avg% depends on the number of rows brought back from the engine (options: row count)

      See 7avg, 7avg% and delta7avg for more details on rolling averages.

       

      Example

      • Example use: Daily change in rolling 7 day average as a percentage of total changes in rolling 7 day average

      NOTE: Measures 1, 2 and 3 are included purely for illustration. It is not necessary to include these measures for the calculation to work.

      Dimension: [transactions].[date]

      Measure 1

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

      Measure 2

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

      Measure 3

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

      Measure 4

      • Name: = Sum
      • Measure:  = transactions.castprice
      • Function: =sum
      • Post: =delta7avg%
      • Value: =
      • Axis: =0
      • Plot:=Y
      • Resolve:=
      • Series Type:=Default
      • Popup:=Default
      • Prefix:=

      Options: Row Count = 30

      Sort Order: [Ascending Label]


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