SSRS Use a formula for a line graph y = mX + b

Question

Hi I want to show a line on a line chart using a formula in the form y = mX + b.   Can't seem to get this to work.   I inputted the formula into the "Value field" of the "Data field" but the line doesn't show up.
X = value for X axis (it's a date);  m and b are query fields (both type real)    The data is grouped on two fields that are specified in the "series field"
There are multiple values for X but only one value for M and B.
So for all dates (X) for each Group 1 AND Group 2 combo: chart this line.
Using: SSRS Visual Studio 2008

Answer 1

Hi 317704,
Linear Regression line might be what you need, you have to get the records in the database using the T-SQL for all the points on the X-Axis following the below formula. Where n is the total number of data points, and the tis and yis are the components of
the data point tuples (ti, yi).
 I give a sample below,
My datasource(AdventureWorksDW2008):
DECLARE @start_month
SMALLDATETIME
DECLARE @end_month
SMALLDATETIME
SET @start_month
= '2002-01-01'
SET @end_month
= '2002-12-01';
SELECT
CAST(CONVERT(CHAR(6),DimTime.FullDateAlternateKey,112)
+ '01'
AS
SMALLDATETIME)
AS CalendarMonth
,SUM(SalesAmount)
AS y
FROM FactInternetSales
INNER
JOIN DimSalesTerritory
ON FactInternetSales.SalesTerritoryKey
= DimSalesTerritory.SalesTerritoryKey
INNER
JOIN DimTime
ON FactInternetSales.OrderDateKey
= DimTime.TimeKey
WHERE DimSalesTerritory.SalesTerritoryKey
= 9 --Australia
AND
DATEPART(YEAR,DimTime.FullDateAlternateKey)
BETWEEN
DATEPART(YEAR,@start_month)
AND DATEPART(YEAR,@end_month)
AND
DATEPART(MONTH,DimTime.FullDateAlternateKey)
BETWEEN
DATEPART(MONTH,@start_month)
AND DATEPART(MONTH,@end_month)
GROUP
BY CONVERT(CHAR(6),DimTime.FullDateAlternateKey,112)
You could get some reference from top sample.
Thanks,
Challen Fu
Challen Fu [MSFT]
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