Method used to create "best fit" trend line

[Kyma]

Hello,
Can you give some details on what method is used to fit a series of data to a straight trend line in the TTrendFunction (TTrendStyle = tsNormal)?
We are using this in our product and have customers who wants to know the method used to generate the trend line.

Thanks,
Kjetil

[Yeray]

Hi Kjetil,

You are a source code customer, aren't you?
Check the following functions in CurvFitt.pas to see how it is exactly calculated:
TCustomTrendFunction.CalculateAllPoints
TCustomTrendFunction.CalculatePeriod
TCustomTrendFunction.CalculateTrend
TCustomTrendFunction.CalculateValues

[Kyma]

Thanks,
I see as expected that the "least square fit" method is used. Just had to get it confirmed. Source code helps

- Kjetil