Filtering data around a trendline

[Nyman]

Hello


I'm having some data of which some of it are of low quality. I know that the data will follow a trendline so I would like to ask you if it is possible to filter the values more that fx 10 % off from the trendline value?

I've attached a example, and as you may see some of the values are wrong.

Best regards,
MAthias

[Andy Pope]

You will need to create another data series containing only those values you wish to trend on.