I see what you mean but I am not sure I know how to do it manually? Can you 
give me an example in the provided graph?  

Τη Κυριακή, 26 Ιουλίου 2015 - 9:45:12 π.μ. UTC-7, ο χρήστης Daniel 
LaLiberte έγραψε:
>
> When you don't always have non-null values in both series, and you are 
> interpolating nulls, then I think you effectively want to compute the 
> average between the non-null value and the interpolated value of nearest 
> non-null values.  Google Charts doesn't provide a way to give you the 
> interpolated values, so you'll have to do your own interpolation just to 
> compute the average.
>
> To compute your average linear trendline as the average of the separately 
> computed trendlines, as you asked originally, there is no built-in way to 
> do that. You would need to get the equation of the trendlines, which we 
> also don't provide yet, and compute a pair of sample points for each 
> trendline, average those values, and use that to compute your own average 
> trendline.  
>
> Might be easier to compute the average series since you only need to do 
> some linear interpolation.   Hope that helps.
>
> On Sun, Jul 26, 2015 at 12:21 PM, Kostas Poulakidas <[email protected] 
> <javascript:>> wrote:
>
>> Hello Daniel,
>>
>> thanks for yor response,
>>
>> 1) I want to show both Series and trendline (no reason to hide it)
>>
>> 2) In my previous example calculating the average is easy But what can I 
>> do in an example like this? https://jsfiddle.net/gpogxs9b/
>>
>
>
>
> -- 
> Daniel LaLiberte <https://plus.google.com/100631381223468223275?prsrc=2> 
>  - 978-394-1058
> [email protected] <javascript:>   5CC, Cambridge MA
> [email protected] <javascript:> 9 Juniper Ridge Road, Acton MA
>  

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