COGNOiSe.com - The IBM Cognos Community

IBM Cognos 10 Platform => Cognos 10 BI => Report Studio => Topic started by: Aspire on 13 Mar 2016 10:44:22 AM

Title: chart: how to force min & max values on axis to avoid extreme values?
Post by: Aspire on 13 Mar 2016 10:44:22 AM
Hi,

How can I exclude extreme values from the axis in a chart? When putting min & max configuration extreme values are still taken into account in my chart..?

Thanks
Title: Re: chart: how to force min & max values on axis to avoid extreme values?
Post by: Lynn on 14 Mar 2016 07:02:54 AM
Can you filter them out of the query?
Title: Re: chart: how to force min & max values on axis to avoid extreme values?
Post by: Aspire on 14 Mar 2016 07:21:17 AM
Lynn,

Yes that's an option, but I would prefer a more dynamic solution. Because maybe tomorrow the extreme value will be another member which was not excluded in the query.. do you understand my point?

Thanks
Title: Re: chart: how to force min & max values on axis to avoid extreme values?
Post by: BigChris on 14 Mar 2016 07:43:00 AM
I don't know if this will help the discussion, but how would you identify the extremes? Are you basing it on standard deviations or similar?
Title: Re: chart: how to force min & max values on axis to avoid extreme values?
Post by: Lynn on 14 Mar 2016 07:53:14 AM
I assumed the extremes were known based on the original post indicating a min/max setting on the axis. Anything dynamic is going to require some understanding of what constitutes elements to be excluded, as Chris has indicated.
Title: Re: chart: how to force min & max values on axis to avoid extreme values?
Post by: navissar on 14 Mar 2016 08:18:00 AM
It's a question of maths. The logic is to identify a baseline and filter out values which are excessively high or low.
So, you can, for instance, identify the mean and SD and not show anything above/below two/three SDs.
Or you could go down the more brute force route of not showing anything bigger/smaller than X times the mean/median.
All these calculations can and should be done in the query.
Title: Re: chart: how to force min & max values on axis to avoid extreme values?
Post by: Aspire on 14 Mar 2016 11:32:10 AM
Thanks all for reactions!

Indeed the extreme values are defined as variance% vs Baseline.

It's a good idea to filter out extremes as +- 100% variation for ex--> thanks for the insight!

KR